We studied the review article about How I investigate eosinophilia, which was published in the International Journal of Laboratory Hematology in August 2018. This paper has clearly and simply introduced how clinicians investigate eosinophilia. Hopefully, it can be helpful to everyone who interested in this field.
This document discusses red blood cell membrane defects such as hereditary spherocytosis and hereditary elliptocytosis. Hereditary spherocytosis is caused by defects in membrane proteins like spectrin, ankyrin, band 3, and protein 4.2 which results in reduced cell surface area, impaired flexibility, and increased permeability. This makes the red blood cells spherical in shape and prone to destruction in the spleen. Hereditary elliptocytosis is caused by weakened linkages in the membrane skeleton that results in elliptical shaped red blood cells. Both conditions are inherited and can cause anemia.
Dr Abdullah Ansari
MBBS, MD Medicine
Aligarh Muslim University
Clinical case
Hemolytic Anemia
Intravascular vs extravascular hemolysis
Classification of hemolytic anemia
Approach to hemolysis
Patient history
Clinical features
Peripheral blood smear
Investigation
Treatment
acute leukemia
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1. HIV can cause a variety of hematological manifestations including anemia, leukopenia, thrombocytopenia, and coagulation disorders due to bone marrow infiltration and effects on hematopoietic progenitor cells.
2. The bone marrow in HIV/AIDS commonly shows hypercellularity, dysplasia of the erythroid and myeloid lineages, plasmacytosis, and lymphoid aggregates. Opportunistic infections also frequently involve the bone marrow.
3. HIV is associated with increased risk of aggressive B-cell lymphomas such as diffuse large B-cell lymphoma. Lymphomas in HIV often involve extranodal sites and the bone marrow.
This document provides an overview of pancytopenia, including its definition, etiology, clinical presentation, diagnostic workup, and treatment approach. Pancytopenia is defined as a low hemoglobin, white blood cell count, and platelet count. It can be caused by primary bone marrow diseases or secondary to other conditions that impair bone marrow function. The diagnostic workup involves blood tests, peripheral smear examination, bone marrow aspiration and biopsy for cytogenetics and immunophenotyping to identify the underlying cause. Specific tests help diagnose conditions like Fanconi anemia, lymphoproloferative disorders, and paroxysmal nocturnal hemoglobinuria. Treatment is directed at managing the specific disease identified as the cause
This document discusses leukemoid and leukoerythroblastic reactions. Leukemoid reactions involve a marked increase in white blood cell count (>50,000/cumm) in response to a stimulus like infection, with immature cells comprising less than 5% and being reversible. Leukoerythroblastic reactions involve immature cells in both the red and white cell lines in peripheral blood due to bone marrow disturbances from conditions like cancer metastases or myelofibrosis. The document differentiates these reactions from conditions like CML, CNL, and CLL based on factors like age of onset, clinical course, blood and bone marrow morphology, and presence of an underlying condition.
Sansar Babu Tiwari presented a slide presentation on hematology focusing on eosinophilia. The presentation included:
1. Analysis of a peripheral blood smear showing 53% eosinophils, with normal RBC and platelet morphology.
2. A discussion of eosinophil morphology, differentiation, and granule composition. Eosinophils arise from bone marrow and traffic to tissues, where they play roles in immunity and tissue damage.
3. An overview of the causes of eosinophilia, which can be secondary/reactive to conditions like parasites, allergies, and drugs, or primary/clonal due to disorders like cancers, idiopathic hypereosin
This document discusses red blood cell membrane defects such as hereditary spherocytosis and hereditary elliptocytosis. Hereditary spherocytosis is caused by defects in membrane proteins like spectrin, ankyrin, band 3, and protein 4.2 which results in reduced cell surface area, impaired flexibility, and increased permeability. This makes the red blood cells spherical in shape and prone to destruction in the spleen. Hereditary elliptocytosis is caused by weakened linkages in the membrane skeleton that results in elliptical shaped red blood cells. Both conditions are inherited and can cause anemia.
Dr Abdullah Ansari
MBBS, MD Medicine
Aligarh Muslim University
Clinical case
Hemolytic Anemia
Intravascular vs extravascular hemolysis
Classification of hemolytic anemia
Approach to hemolysis
Patient history
Clinical features
Peripheral blood smear
Investigation
Treatment
acute leukemia
For More Medicine Free PPT - http://playnever.blogspot.com/
For Health benefits and medicine videos Subscribe youtube channel - https://www.youtube.com/playlist?list=PLKg-H-sMh9G01zEg4YpndngXODW2bq92w
1. HIV can cause a variety of hematological manifestations including anemia, leukopenia, thrombocytopenia, and coagulation disorders due to bone marrow infiltration and effects on hematopoietic progenitor cells.
2. The bone marrow in HIV/AIDS commonly shows hypercellularity, dysplasia of the erythroid and myeloid lineages, plasmacytosis, and lymphoid aggregates. Opportunistic infections also frequently involve the bone marrow.
3. HIV is associated with increased risk of aggressive B-cell lymphomas such as diffuse large B-cell lymphoma. Lymphomas in HIV often involve extranodal sites and the bone marrow.
This document provides an overview of pancytopenia, including its definition, etiology, clinical presentation, diagnostic workup, and treatment approach. Pancytopenia is defined as a low hemoglobin, white blood cell count, and platelet count. It can be caused by primary bone marrow diseases or secondary to other conditions that impair bone marrow function. The diagnostic workup involves blood tests, peripheral smear examination, bone marrow aspiration and biopsy for cytogenetics and immunophenotyping to identify the underlying cause. Specific tests help diagnose conditions like Fanconi anemia, lymphoproloferative disorders, and paroxysmal nocturnal hemoglobinuria. Treatment is directed at managing the specific disease identified as the cause
This document discusses leukemoid and leukoerythroblastic reactions. Leukemoid reactions involve a marked increase in white blood cell count (>50,000/cumm) in response to a stimulus like infection, with immature cells comprising less than 5% and being reversible. Leukoerythroblastic reactions involve immature cells in both the red and white cell lines in peripheral blood due to bone marrow disturbances from conditions like cancer metastases or myelofibrosis. The document differentiates these reactions from conditions like CML, CNL, and CLL based on factors like age of onset, clinical course, blood and bone marrow morphology, and presence of an underlying condition.
Sansar Babu Tiwari presented a slide presentation on hematology focusing on eosinophilia. The presentation included:
1. Analysis of a peripheral blood smear showing 53% eosinophils, with normal RBC and platelet morphology.
2. A discussion of eosinophil morphology, differentiation, and granule composition. Eosinophils arise from bone marrow and traffic to tissues, where they play roles in immunity and tissue damage.
3. An overview of the causes of eosinophilia, which can be secondary/reactive to conditions like parasites, allergies, and drugs, or primary/clonal due to disorders like cancers, idiopathic hypereosin
This document discusses the Leukocyte Alkaline Phosphatase (LAP) stain, which is used to determine whether a high white blood cell count is due to a reactive or leukemic process. The LAP stain tests for the presence of alkaline phosphatase in white blood cells. Cells with more differentiation will stain more strongly, while leukemic cells will have little to no staining. Scoring 100 neutrophils on a scale of 0-4 and calculating the total score provides the "LAP score", with a high score indicating a reactive condition and low score suggesting chronic myelogenous leukemia. The document outlines the purpose, principle, sampling, reagents, interpretation and factors that can affect the LAP stain results.
Approach to microcytic hypochromic anemiaShinjan Patra
This document discusses the approach to evaluating and diagnosing microcytic hypochromic anemia. It begins by covering the basics of hemoglobin synthesis and iron metabolism. It then describes the morphological classification of anemias and discusses the main causes of microcytic anemia including iron deficiency anemia, anemia of chronic disease, thalassemia, sideroblastic anemia, and lead poisoning. For each condition, it outlines the pathogenesis, clinical features, diagnostic evaluation, and treatment approach. Throughout it emphasizes the importance of obtaining a thorough history and using iron studies, blood counts, and other tests to differentiate between the various microcytic anemia etiologies.
Platelet function tests.pptx 2.pptx finalAnupam Singh
This document summarizes platelet function testing. It discusses how platelets are formed from megakaryocytes in the bone marrow and circulate in the bloodstream. The major platelet function tests are platelet aggregometry, flow cytometry, and point-of-care tests like the impact cone and plate analyzer and thromboelastography. These tests are used to diagnose platelet disorders and monitor antiplatelet therapy. The document also briefly discusses platelet-derived microparticles and microRNAs, which can provide information about platelet activation and signaling.
1. The document discusses the differentiation between myeloid leukemoid reaction, chronic myeloid leukemia (CML), and chronic neutrophilic leukemia (CNL).
2. Key differences include peripheral smear findings, bone marrow aspirate/biopsy pictures, LAP scores, cytogenetics, and immunophenotyping results.
3. A leukemoid reaction is secondary to an underlying cause and shows features of that cause, while CML and CNL are myeloproliferative neoplasms with distinct clinical features, lab findings, and disease progression.
Myeloproliferative neoplasms (MPNs) are a group of disorders where the bone marrow produces too many red or white blood cells. The presentation outlines the history, classification, signs and symptoms, causes related to genetic mutations like JAK2, diagnosis through blood and bone marrow tests, and treatments including medications, radiation, surgery, and stem cell transplant. MPNs include chronic myeloid leukemia, polycythemia vera, essential thrombocythemia, myelofibrosis, and rare disorders like chronic neutrophilic leukemia and mast cell disease.
Primary myelofibrosis (PMF) is a chronic blood cancer characterized by excessive scar tissue in the bone marrow that impairs blood cell production. It typically affects people over age 50 and common symptoms include fatigue, abdominal pain or fullness from an enlarged spleen or liver, and easy bruising or bleeding from low blood cell counts. The disease is diagnosed based on physical signs of splenomegaly, blood tests showing low blood cell counts and abnormal cells, and examination of the bone marrow showing increased fibrosis.
This slide presentation summarizes the case of a 50-year-old man with fatigue and weight loss who was found to have lymphocytosis, anemia, hepatosplenomegaly, and lymphadenopathy. Peripheral blood smear, bone marrow biopsy, flow cytometry and cytogenetic testing supported a diagnosis of chronic lymphocytic leukemia (CLL) stage III. He was started on chemoimmunotherapy but did not improve, so he was considered for bone marrow transplantation. The presentation provides details on the epidemiology, clinical features, diagnostic criteria, prognostic factors, treatment approaches and histological transformation of CLL.
Hb electrophoresis (principle materials and procedure)hussainshahid55
This document provides information on hemoglobin electrophoresis, including its definition, purpose, principles, procedures, materials, risks, results, factors that can affect the test, and applications. Hemoglobin electrophoresis is used to screen for and diagnose blood disorders by separating normal and abnormal hemoglobin types in blood based on their electrical charges. The procedure involves extracting hemoglobin from blood samples, running the samples through a gel or cellulose acetate strip using an electrical current, then staining and analyzing the strips to identify abnormal hemoglobin levels or variants that can indicate blood disorders.
Dr Sarath Menon presents an approach to diagnosing and classifying hemolytic anemia. Hemolytic anemia results from increased red blood cell destruction and bone marrow compensation. It can be congenital/hereditary or acquired. Classification includes intracorpuscular defects like hemoglobinopathies and enzymopathies, and extracorpuscular factors like mechanical destruction, toxic agents, infections, and autoimmune causes. Diagnosis involves confirming hemolysis and determining the etiology through history, physical exam, peripheral smear, and ancillary lab tests. Common etiologies discussed in detail include sickle cell disease, thalassemia, G6PD deficiency, membrane defects like hereditary spherocytosis, and autoimmune
This document discusses several special hematology stains including Periodic acid-Schiff (PAS), Perl's Prussian Blue reaction, leukocyte alkaline phosphatase (LAP), and myeloperoxidase. PAS stains carbohydrates such as glycogen and is used to identify abnormal erythroblasts and dysplastic megakaryocytes. Perl's Prussian Blue stains iron and demonstrates ring sideroblasts and Pappenheimer bodies. LAP stains neutrophil alkaline phosphatase and helps differentiate chronic myelogenous leukemia. Myeloperoxidase stains the enzyme in neutrophils, monocytes and eosinophils and is used to identify myeloid or monocytic leukemias.
challenges in interpreting abnormal hemoglobin study- the key is to correlate with patient age, ethnicity,RBC indices & morphology findings. Two tier approach for correct characterization of abnormal hemoglobins of HPLC &/or capillary electrophoresis.
Chronic myeloid leukemia (CML) is a type of leukemia characterized by the increased and unregulated growth of myeloid cells in the bone marrow. It results from a reciprocal translocation between chromosomes 9 and 22, known as the Philadelphia chromosome, which generates the BCR-ABL fusion gene. This fusion gene encodes for a constitutively active tyrosine kinase that drives the overproduction of white blood cells. CML progresses through chronic, accelerated and blast crisis phases and can be diagnosed by blood and bone marrow tests and identification of the Philadelphia chromosome. Treatment involves tyrosine kinase inhibitors like imatinib, dasatinib or nilotinib, stem cell transplant, or other drugs and monitoring response based on blood counts
This document discusses chronic leukemias and myeloproliferative disorders including chronic myeloid leukemia (CML) and myelofibrosis. CML is distinguished from other myeloproliferative disorders by the presence of the Philadelphia chromosome and BCR-ABL fusion gene. CML is characterized by leukocytosis, thrombocytosis, and anemia. It progresses through chronic, accelerated, and blast phases defined by increasing blast counts and symptoms. The massive spleen seen in CML is indicative of the underlying myeloproliferative process.
Hypereosinophilic Syndrome (HES) is a rare condition characterized by elevated levels of eosinophils in the blood (eosinophilia) and tissue damage caused by eosinophils. The document discusses the historical background, definition, pathogenesis, epidemiology, classification, and clinical manifestations of HES. It defines HES based on eosinophilia greater than 1500 cells/microliter for more than 6 months with evidence of organ damage after ruling out other causes. HES can be classified into myeloproliferative and lymphocytic forms based on the underlying pathogenesis. The myeloproliferative form involves mutations in hematopoietic cells that drive eosinophil production while the lymphocy
This document summarizes the functions of leukocytes (white blood cells), which develop from stem cells in the bone marrow and include granulocytes (neutrophils, basophils, eosinophils), monocytes, and lymphocytes. Leukocytes protect the host from pathogens through innate and adaptive immune responses. Neutrophils are the most abundant granulocyte and use adhesion, chemotaxis, phagocytosis, and microbial killing to defend against bacteria and fungi. Defects in these leukocyte functions can lead to increased susceptibility to infection. The document then discusses specific disorders that impact leukocyte development and function.
Bone marrow biopsy and aspiration provide qualitative and quantitative assessment of hematopoiesis. It can help make diagnoses of blood disorders like anemia and help stage diseases like lymphoma. The bone marrow has a structured organization with hematopoietic and stromal components. Biopsy and aspiration samples are analyzed microscopically after staining to evaluate cellularity, maturation of blood cell lineages, iron stores, and detect any abnormalities. This procedure helps diagnose conditions affecting the bone marrow including infections, storage diseases, and cancers.
This document discusses autoimmune hemolytic anemia (AIHA). It begins by defining hemolytic anemia and classifying it as either congenital/hereditary or acquired. It then discusses the classification of hemolytic anemias as either intracorpuscular or extracorpuscular. The mechanisms, clinical features, laboratory findings, and treatments of warm AIHA and cold AIHA are described in detail. Warm AIHA is mediated by IgG antibodies and most commonly involves the Rh blood group antigen. Cold AIHA involves IgM antibodies reactive below 37°C and usually targets the I antigen. Corticosteroids are first-line treatment for warm AIHA while cold AIHA may be associated with underlying infections or malignancies.
Acute leukemias are cancers of the blood and bone marrow characterized by an overproduction of immature white blood cells. There are two main types: acute myeloid leukemia (AML) involving myeloid cells, and acute lymphoblastic leukemia (ALL) involving lymphoblasts. AML and ALL are classified according to cell morphology, immunophenotyping, genetics, and other lab findings. Common symptoms include fatigue, bleeding, and infections due to low blood cell counts. The document discusses the definitions, types, causes, diagnostic criteria, and clinical manifestations of acute leukemias.
This document presents 9 cases involving patients presenting with various hematological abnormalities and disorders. The cases include examples of megaloblastic anemia, Fanconi anemia, aplastic anemia, paroxysmal nocturnal hemoglobinuria, acute lymphoblastic leukemia, acute myeloid leukemia with myelomonocytic features, myelodysplastic syndrome, disseminated tuberculosis, hypersplenism and hemophagocytic syndrome. For each case, the patient history, physical findings and diagnostic workup are provided, along with the diagnoses and relevant background information.
Electrophoresis is a technique used to separate charged biomolecules like proteins and nucleic acids. It works by applying an electrical current to move these molecules through a buffer or gel based on their size and charge. Hemoglobin electrophoresis specifically separates different types of hemoglobin in the blood based on their charge. This test can detect abnormalities associated with conditions like sickle cell disease or thalassemias by identifying abnormal levels or types of hemoglobin present. The document provides details on how hemoglobin electrophoresis works, the normal hemoglobin types found, common abnormal types, and how the test is performed and interpreted.
1. Polycythemia vera (PV) is a chronic myeloproliferative neoplasm characterized by an overproduction of red blood cells without an identifiable stimulus. It commonly presents with erythrocytosis, splenomegaly, thrombosis, and pruritus.
2. The main cause of PV is a mutation in the JAK2 gene, but some patients have mutations in exon 12. Diagnosis requires tests to distinguish absolute from relative erythrocytosis. Treatment focuses on phlebotomy and medications to control symptoms and prevent complications.
3. Primary myelofibrosis (PMF) is a chronic myeloproliferative neoplasm involving clonal proliferation and
This document discusses the case of a 35-year-old female patient presenting with fever, fatigue, and shortness of breath. Her medical history includes a hysterectomy for menorrhagia and treatment for genitourinary tuberculosis. On examination, she has pallor and tachycardia. Laboratory tests show pancytopenia and blasts in her peripheral blood smear. A bone marrow biopsy confirms the diagnosis of acute myeloid leukemia. The discussion reviews the epidemiology, etiology, classification, clinical presentation, diagnostic workup, and initial treatment evaluation for AML.
This document discusses the Leukocyte Alkaline Phosphatase (LAP) stain, which is used to determine whether a high white blood cell count is due to a reactive or leukemic process. The LAP stain tests for the presence of alkaline phosphatase in white blood cells. Cells with more differentiation will stain more strongly, while leukemic cells will have little to no staining. Scoring 100 neutrophils on a scale of 0-4 and calculating the total score provides the "LAP score", with a high score indicating a reactive condition and low score suggesting chronic myelogenous leukemia. The document outlines the purpose, principle, sampling, reagents, interpretation and factors that can affect the LAP stain results.
Approach to microcytic hypochromic anemiaShinjan Patra
This document discusses the approach to evaluating and diagnosing microcytic hypochromic anemia. It begins by covering the basics of hemoglobin synthesis and iron metabolism. It then describes the morphological classification of anemias and discusses the main causes of microcytic anemia including iron deficiency anemia, anemia of chronic disease, thalassemia, sideroblastic anemia, and lead poisoning. For each condition, it outlines the pathogenesis, clinical features, diagnostic evaluation, and treatment approach. Throughout it emphasizes the importance of obtaining a thorough history and using iron studies, blood counts, and other tests to differentiate between the various microcytic anemia etiologies.
Platelet function tests.pptx 2.pptx finalAnupam Singh
This document summarizes platelet function testing. It discusses how platelets are formed from megakaryocytes in the bone marrow and circulate in the bloodstream. The major platelet function tests are platelet aggregometry, flow cytometry, and point-of-care tests like the impact cone and plate analyzer and thromboelastography. These tests are used to diagnose platelet disorders and monitor antiplatelet therapy. The document also briefly discusses platelet-derived microparticles and microRNAs, which can provide information about platelet activation and signaling.
1. The document discusses the differentiation between myeloid leukemoid reaction, chronic myeloid leukemia (CML), and chronic neutrophilic leukemia (CNL).
2. Key differences include peripheral smear findings, bone marrow aspirate/biopsy pictures, LAP scores, cytogenetics, and immunophenotyping results.
3. A leukemoid reaction is secondary to an underlying cause and shows features of that cause, while CML and CNL are myeloproliferative neoplasms with distinct clinical features, lab findings, and disease progression.
Myeloproliferative neoplasms (MPNs) are a group of disorders where the bone marrow produces too many red or white blood cells. The presentation outlines the history, classification, signs and symptoms, causes related to genetic mutations like JAK2, diagnosis through blood and bone marrow tests, and treatments including medications, radiation, surgery, and stem cell transplant. MPNs include chronic myeloid leukemia, polycythemia vera, essential thrombocythemia, myelofibrosis, and rare disorders like chronic neutrophilic leukemia and mast cell disease.
Primary myelofibrosis (PMF) is a chronic blood cancer characterized by excessive scar tissue in the bone marrow that impairs blood cell production. It typically affects people over age 50 and common symptoms include fatigue, abdominal pain or fullness from an enlarged spleen or liver, and easy bruising or bleeding from low blood cell counts. The disease is diagnosed based on physical signs of splenomegaly, blood tests showing low blood cell counts and abnormal cells, and examination of the bone marrow showing increased fibrosis.
This slide presentation summarizes the case of a 50-year-old man with fatigue and weight loss who was found to have lymphocytosis, anemia, hepatosplenomegaly, and lymphadenopathy. Peripheral blood smear, bone marrow biopsy, flow cytometry and cytogenetic testing supported a diagnosis of chronic lymphocytic leukemia (CLL) stage III. He was started on chemoimmunotherapy but did not improve, so he was considered for bone marrow transplantation. The presentation provides details on the epidemiology, clinical features, diagnostic criteria, prognostic factors, treatment approaches and histological transformation of CLL.
Hb electrophoresis (principle materials and procedure)hussainshahid55
This document provides information on hemoglobin electrophoresis, including its definition, purpose, principles, procedures, materials, risks, results, factors that can affect the test, and applications. Hemoglobin electrophoresis is used to screen for and diagnose blood disorders by separating normal and abnormal hemoglobin types in blood based on their electrical charges. The procedure involves extracting hemoglobin from blood samples, running the samples through a gel or cellulose acetate strip using an electrical current, then staining and analyzing the strips to identify abnormal hemoglobin levels or variants that can indicate blood disorders.
Dr Sarath Menon presents an approach to diagnosing and classifying hemolytic anemia. Hemolytic anemia results from increased red blood cell destruction and bone marrow compensation. It can be congenital/hereditary or acquired. Classification includes intracorpuscular defects like hemoglobinopathies and enzymopathies, and extracorpuscular factors like mechanical destruction, toxic agents, infections, and autoimmune causes. Diagnosis involves confirming hemolysis and determining the etiology through history, physical exam, peripheral smear, and ancillary lab tests. Common etiologies discussed in detail include sickle cell disease, thalassemia, G6PD deficiency, membrane defects like hereditary spherocytosis, and autoimmune
This document discusses several special hematology stains including Periodic acid-Schiff (PAS), Perl's Prussian Blue reaction, leukocyte alkaline phosphatase (LAP), and myeloperoxidase. PAS stains carbohydrates such as glycogen and is used to identify abnormal erythroblasts and dysplastic megakaryocytes. Perl's Prussian Blue stains iron and demonstrates ring sideroblasts and Pappenheimer bodies. LAP stains neutrophil alkaline phosphatase and helps differentiate chronic myelogenous leukemia. Myeloperoxidase stains the enzyme in neutrophils, monocytes and eosinophils and is used to identify myeloid or monocytic leukemias.
challenges in interpreting abnormal hemoglobin study- the key is to correlate with patient age, ethnicity,RBC indices & morphology findings. Two tier approach for correct characterization of abnormal hemoglobins of HPLC &/or capillary electrophoresis.
Chronic myeloid leukemia (CML) is a type of leukemia characterized by the increased and unregulated growth of myeloid cells in the bone marrow. It results from a reciprocal translocation between chromosomes 9 and 22, known as the Philadelphia chromosome, which generates the BCR-ABL fusion gene. This fusion gene encodes for a constitutively active tyrosine kinase that drives the overproduction of white blood cells. CML progresses through chronic, accelerated and blast crisis phases and can be diagnosed by blood and bone marrow tests and identification of the Philadelphia chromosome. Treatment involves tyrosine kinase inhibitors like imatinib, dasatinib or nilotinib, stem cell transplant, or other drugs and monitoring response based on blood counts
This document discusses chronic leukemias and myeloproliferative disorders including chronic myeloid leukemia (CML) and myelofibrosis. CML is distinguished from other myeloproliferative disorders by the presence of the Philadelphia chromosome and BCR-ABL fusion gene. CML is characterized by leukocytosis, thrombocytosis, and anemia. It progresses through chronic, accelerated, and blast phases defined by increasing blast counts and symptoms. The massive spleen seen in CML is indicative of the underlying myeloproliferative process.
Hypereosinophilic Syndrome (HES) is a rare condition characterized by elevated levels of eosinophils in the blood (eosinophilia) and tissue damage caused by eosinophils. The document discusses the historical background, definition, pathogenesis, epidemiology, classification, and clinical manifestations of HES. It defines HES based on eosinophilia greater than 1500 cells/microliter for more than 6 months with evidence of organ damage after ruling out other causes. HES can be classified into myeloproliferative and lymphocytic forms based on the underlying pathogenesis. The myeloproliferative form involves mutations in hematopoietic cells that drive eosinophil production while the lymphocy
This document summarizes the functions of leukocytes (white blood cells), which develop from stem cells in the bone marrow and include granulocytes (neutrophils, basophils, eosinophils), monocytes, and lymphocytes. Leukocytes protect the host from pathogens through innate and adaptive immune responses. Neutrophils are the most abundant granulocyte and use adhesion, chemotaxis, phagocytosis, and microbial killing to defend against bacteria and fungi. Defects in these leukocyte functions can lead to increased susceptibility to infection. The document then discusses specific disorders that impact leukocyte development and function.
Bone marrow biopsy and aspiration provide qualitative and quantitative assessment of hematopoiesis. It can help make diagnoses of blood disorders like anemia and help stage diseases like lymphoma. The bone marrow has a structured organization with hematopoietic and stromal components. Biopsy and aspiration samples are analyzed microscopically after staining to evaluate cellularity, maturation of blood cell lineages, iron stores, and detect any abnormalities. This procedure helps diagnose conditions affecting the bone marrow including infections, storage diseases, and cancers.
This document discusses autoimmune hemolytic anemia (AIHA). It begins by defining hemolytic anemia and classifying it as either congenital/hereditary or acquired. It then discusses the classification of hemolytic anemias as either intracorpuscular or extracorpuscular. The mechanisms, clinical features, laboratory findings, and treatments of warm AIHA and cold AIHA are described in detail. Warm AIHA is mediated by IgG antibodies and most commonly involves the Rh blood group antigen. Cold AIHA involves IgM antibodies reactive below 37°C and usually targets the I antigen. Corticosteroids are first-line treatment for warm AIHA while cold AIHA may be associated with underlying infections or malignancies.
Acute leukemias are cancers of the blood and bone marrow characterized by an overproduction of immature white blood cells. There are two main types: acute myeloid leukemia (AML) involving myeloid cells, and acute lymphoblastic leukemia (ALL) involving lymphoblasts. AML and ALL are classified according to cell morphology, immunophenotyping, genetics, and other lab findings. Common symptoms include fatigue, bleeding, and infections due to low blood cell counts. The document discusses the definitions, types, causes, diagnostic criteria, and clinical manifestations of acute leukemias.
This document presents 9 cases involving patients presenting with various hematological abnormalities and disorders. The cases include examples of megaloblastic anemia, Fanconi anemia, aplastic anemia, paroxysmal nocturnal hemoglobinuria, acute lymphoblastic leukemia, acute myeloid leukemia with myelomonocytic features, myelodysplastic syndrome, disseminated tuberculosis, hypersplenism and hemophagocytic syndrome. For each case, the patient history, physical findings and diagnostic workup are provided, along with the diagnoses and relevant background information.
Electrophoresis is a technique used to separate charged biomolecules like proteins and nucleic acids. It works by applying an electrical current to move these molecules through a buffer or gel based on their size and charge. Hemoglobin electrophoresis specifically separates different types of hemoglobin in the blood based on their charge. This test can detect abnormalities associated with conditions like sickle cell disease or thalassemias by identifying abnormal levels or types of hemoglobin present. The document provides details on how hemoglobin electrophoresis works, the normal hemoglobin types found, common abnormal types, and how the test is performed and interpreted.
1. Polycythemia vera (PV) is a chronic myeloproliferative neoplasm characterized by an overproduction of red blood cells without an identifiable stimulus. It commonly presents with erythrocytosis, splenomegaly, thrombosis, and pruritus.
2. The main cause of PV is a mutation in the JAK2 gene, but some patients have mutations in exon 12. Diagnosis requires tests to distinguish absolute from relative erythrocytosis. Treatment focuses on phlebotomy and medications to control symptoms and prevent complications.
3. Primary myelofibrosis (PMF) is a chronic myeloproliferative neoplasm involving clonal proliferation and
This document discusses the case of a 35-year-old female patient presenting with fever, fatigue, and shortness of breath. Her medical history includes a hysterectomy for menorrhagia and treatment for genitourinary tuberculosis. On examination, she has pallor and tachycardia. Laboratory tests show pancytopenia and blasts in her peripheral blood smear. A bone marrow biopsy confirms the diagnosis of acute myeloid leukemia. The discussion reviews the epidemiology, etiology, classification, clinical presentation, diagnostic workup, and initial treatment evaluation for AML.
Disease of older males.
The Philadelphia chromosome - BCR-ABL gene and it’s Tyrosine kinase protein – central to the pathogenesis.
Occurs in 3 phases
Imatinib has revolutionized the management
This document summarizes several myeloid disorders including myelodysplastic syndrome (MDS), chronic myeloid leukemia (CML), polycythemia vera (PV), and essential thrombocythemia (ET). MDS is a heterogeneous group of malignant stem cell disorders characterized by dysplastic and ineffective blood cell production with a risk of progressing to acute myeloid leukemia. CML is caused by the Philadelphia chromosome and results in excessive granulocyte production. PV is characterized by an elevated red blood cell mass and is caused by a JAK2 mutation. ET involves a sustained increased in platelet count due to megakaryocyte proliferation. These conditions are diagnosed based on blood tests, bone marrow biopsy, and genetic
Chronic myelogenous leukemia (CML) is a myeloproliferative disorder characterized by increased proliferation of granulocytic cells. The initiating factor of CML is an acquired genetic translocation that fuses the BCR gene on chromosome 22 and the ABL gene on chromosome 9, producing the Philadelphia chromosome and the BCR-ABL fusion gene. This gene encodes for an unregulated tyrosine kinase that drives uncontrolled proliferation of myeloid cells. CML progresses through chronic, accelerated, and blast phases as the disease advances and more immature cells appear in the blood and bone marrow over time. Diagnosis is confirmed by detecting the Philadelphia chromosome or BCR-ABL fusion using techniques like fluorescence in situ hybrid
Aplastic anemia is a bone marrow failure syndrome characterized by pancytopenia and a hypocellular bone marrow. It can be caused by radiation, chemicals, drugs, infections, autoimmune or genetic conditions. Patients present with bleeding, anemia symptoms, or infection. Diagnosis involves blood tests showing pancytopenia and low reticulocytes, along with a bone marrow biopsy demonstrating a hypocellular marrow. Treatment involves stem cell transplant or immunosuppression with antithymocyte globulin and cyclosporine.
Approach to pancytopenia presentation mediconemidhat2502
This document discusses an approach to evaluating and diagnosing pancytopenia. Pancytopenia is defined as a decrease in all three blood cell lines. It outlines criteria for defining pancytopenia in adults and children. It then discusses potential etiologies including bone marrow disorders, systemic diseases, infections, inherited conditions, and acquired aplastic anemia. Specific inherited conditions that can cause pancytopenia like Fanconi anemia are described in detail. The document concludes by presenting several clinical cases to demonstrate approaches to diagnosing different causes of pancytopenia.
Approach to Pancytopenia with cases.pptxYogeetaTanty1
Approach to pancytopenia with case based discussion and brief details regarding each condition. Causes of pancytopenia. Details of congenital causes of aplastic anemia.
Leukemia is the most common pediatric malignancy, accounting for 1/3 of all childhood cancers. It is defined as the malignant clonal proliferation of lymphoid or myeloid precursor cells in the bone marrow and infiltration of other organs. The presentation includes general symptoms like fever, fatigue, and pallor as well as hematological effects from bone marrow invasion including anemia, neutropenia, and thrombocytopenia. Diagnosis involves blood tests, bone marrow examination, and other investigations. Treatment consists of induction chemotherapy followed by consolidation and maintenance therapy to achieve remission and prevent relapse.
1. Chronic myeloproliferative disorders are a group of stem cell disorders characterized by overproduction of mature white blood cells, red blood cells, or platelets.
2. Chronic myeloid leukemia is caused by the Philadelphia chromosome which forms the BCR-ABL fusion gene. It progresses through chronic, accelerated, and blast crisis phases.
3. Other myeloproliferative neoplasms discussed include polycythemia vera, essential thrombocythemia, primary myelofibrosis, and chronic lymphocytic leukemia.
This document discusses kidney cancer (renal cell carcinoma). It covers the epidemiology, etiology, hereditary forms, VHL disease, histology, staging, diagnosis, and screening recommendations. Some key points:
1. RCC incidence is increasing with a peak age of 60-70. Risk factors include smoking, obesity, and family history. Clear cell RCC is the most common type.
2. VHL disease is a hereditary form associated with clear cell RCC and other tumors. It is caused by a defective VHL gene.
3. Diagnosis is often incidental but may involve flank pain, hematuria, or mass. Imaging includes ultrasound, CT, MRI, and PET
Leukemias are the most common cancers affecting children, with acute lymphoblastic leukemia (ALL) accounting for 73% of cases and acute myeloid leukemia (AML) accounting for 18% of cases. ALL incidence peaks between ages 2-5 years and accounts for 25-30% of all childhood cancers. Treatment involves induction, consolidation/intensification, and continuation phases using chemotherapy, immunotherapy, stem cell transplantation, and supportive care. The goal is to achieve remission and prevent relapse through risk stratification and tailored therapy.
This document discusses aplastic anemia, including its definition, causes, pathophysiology, symptoms, diagnosis, treatment, and differential diagnosis. Aplastic anemia is a condition where the bone marrow fails to produce sufficient new blood cells, leading to pancytopenia. It can be caused by radiation, chemicals, drugs, infections, autoimmune or genetic disorders. Diagnosis involves blood tests showing low blood cell counts and a bone marrow biopsy appearing hypocellular. Treatment options include stem cell transplant or immunosuppression with antithymocyte globulin and cyclosporine to recover bone marrow function.
This case presentation describes a 55-year-old male referred for management of severe anemia. He has a history of recurrent kidney stones, hypertension, diabetes, and back pain. Laboratory tests reveal severe anemia with rouleaux formation. Further workup shows evidence of a gammopathy. A bone marrow biopsy is needed to confirm a diagnosis of multiple myeloma, which can cause anemia and kidney damage through paraprotein production and bone lesions. Treatment involves supportive care, chemotherapy, and stem cell transplantation in eligible patients.
1. Chronic myelogenous leukemia (CML) is a type of cancer that affects the white blood cells and is characterized by the Philadelphia chromosome, which results from a translocation between chromosomes 9 and 22.
2. CML progresses through three phases: chronic, accelerated, and blast crisis. The chronic phase is usually asymptomatic with mild symptoms like splenomegaly.
3. Diagnosis of CML involves blood tests showing elevated white blood cell count with left shift, bone marrow biopsy demonstrating hypercellularity with immature cells, and identification of the Philadelphia chromosome through cytogenetic or molecular testing.
This document discusses myeloproliferative disorders, which are clonal stem cell disorders characterized by overproduction of one or more myeloid cell lines. The common bcr-abl negative myeloproliferative disorders discussed are polycythemia vera, essential thrombocythemia, and myelofibrosis. JAK2 mutations are involved in the pathogenesis of many of these disorders. The document also discusses mast cell disease, hypereosinophilia, and other related rare conditions.
Leukemias are the most common cancers in children, with acute lymphoblastic leukemia (ALL) accounting for 73% of cases and acute myeloid leukemia (AML) accounting for 18% of cases. ALL peaks between ages 2-5 years and accounts for 25-30% of all childhood cancers. Treatment involves induction, consolidation/intensification, and continuation phases using chemotherapy protocols over 2-3 years. Supportive care and risk stratification are important for managing treatment and prognosis.
Acute lymphoblastic leukemia (ALL) is a cancer of the lymphoid line of blood cells characterized by the proliferation of immature lymphocytes in the bone marrow. Diagnosis requires identifying at least 20% lymphoblasts in the bone marrow. Testing includes bone marrow biopsy and aspiration with immunophenotyping, cytogenetics, lumbar puncture and other studies. Proper classification is important for determining prognosis and selecting optimal treatment strategies.
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4. Introduction- impotence of eosinophil
• produce + store more than 30 cytokines, chemokines, and growth factors
→ vital to immune system response
• dysregulation can result in abnormal organ infiltration of the skin, heart,
and lung which can have life‐threatening consequences.
5. Background
• bone marrow: 1%‐6%
• peripheral blood: 3%‐5% (0.35‐0.5 × 109/L)
• Eosinophilia
mild
• up to
1.5 × 109/L
moderate
• 1.5‐5 × 109/L
severe
• >5 × 109/L
7. Diagnosis-histomorphology
• round to oval
• 10 to 15 μm in diameter
• nuclear: cytoplasmic ratio of 1:3
• refractile, coarse, orange‐red granules, uniform in size and
evenly fill the cytoplasm
• mature eosinophil: 80% two‐lobed nucleus with lobes of equal size and
ovoid shape
8. Eosinophil with atypical
nuclear segmentation
and cytoplasmic
vacuoles
Atypical eosinophil with
cytoplasmic vacuoles
Atypical eosinophil with
uneven granule
distribution and
cytoplasmic vacuoles
Circulating eosinophilic
myelocyte
Hypercellular marrow
with eosinophil
hyperplasia
Normal eosinophil
14. Case 1
• A 73-year-old man with history of prostate cancer
• Chief complaint: peripheral eosinophilia (AEC: 1700) for 3
months
14
No constitutional symptoms
No allergic disorders
No recent travel
No skin rashes
No lymphadenopathy
15. Ancillary test
15
Laboratory panel • Exclude allergic, infectious and autoimmune disorders
Peripheral blood
smear
• No circulating blasts, atypical lymphoid cells, or dysplastic
change
Bone marrow • 11.3% eosinophils with background maturing trilineage
hematopoiesis
Flow cytometry • No atypical immunophenotype
Karyotyping • A normal male karyotype
FISH • Negative for MDS
• No abnormality of PDGFRA
16. Reactive eosinophilia
• Eosinophilia is secondary in most cases.
• If not, evaluation for a primary eosinophilic disorder should be
performed.
16
17. Case 2
• A 58-year-old man without past medical history
• Chief complaint: fever and skin rash
17
Pruritic skin rash for 4 years, involving
bilateral extremities
Wax and wane
No recent travel
Bilateral axillary lymphadenopathy
Scaly rash
18. Ancillary test
18
Peripheral blood
smear
• Leukocytosis with eosinophilia (AEC: 4800)
• No circulating blasts, atypical lymphoid cells, or dysplastic
change
Bone marrow • Increased eosinophils with background maturing
trilineage hematopoiesis
Flow cytometry • A small CD3 and CD4 positiveT-cell population with
aberrant loss of CD7
Karyotyping • A normal male karyotype
FISH • Negative for MDS
• No abnormality of PDGFRA
19. Biopsy
• Skin
Fibrosis of papillary dermis
Psoriasiform changes
Hyperkeratosis with mild perivascular chronic inflammation with no
epidermotropism
• Lymph node
Dermatopathic lymphadenitis
19
20. Lymphocytic-variant hypereosinophilic
syndrome (L-HES)
• A clonal expansion of phenotypically aberrantT-cells with a
subsequent secondary eosinophilia
• Often present with cutaneous manifestations
• End-organ damage including cardiac and neurologic
involvement
• Development of overtT-cell neoplasms is well described.
20
21. Case 3
• A 74-year-old woman with history of allergic rhinitis and
transient ischemic attack
• Chief complaint: flu-like symptoms for 3 months
21
Fever, weakness, fatigue, night sweats, and
early satiety
No recent travel
Splenomegaly without lymphadenopathy
22. Ancillary
22
Cardiac workup • Restrictive cardiomegaly and mitral valve regurgitation
Peripheral blood
smear
• Leukoerythroblastic smear
• Neutrophilia, including a left shift to few blasts (7%)
• Eosinophilia (AEC: 16400) with atypical and immature
forms
Bone marrow • Hypercellular marrow
Flow cytometry • Myeloid predominant marrow with increased basophils
Karyotyping • A gain of chromosome 8 without t(9;22)
FISH • No abnormality of PDGFRA/PDGFRB/FGFR1
23. Chronic eosinophilic leukemia, not
otherwise specified (CEL, NOS)
• Myeloproliferative neoplasm: a clonal population of eosinophil
precursors, with blast < 20%
• Molecular genetic abnormality:TET2, ASXL1, DNMT3A
Can be seen in a minority of normal elderly people
• Must exclude other MPN and AML
No rearrangement of PDGFRA, PDGFRB, or FGFR1
No PCM1-JAK2 fusion
23
24. Idiopathic hypereosinophilic syndrome
(IHES)
• No increase in blasts
• End organ damage is present.
• Next-generation sequencing positive: similar clinical features
and bone marrow findings as CEL, NOS
24
25. Case 4
48‐year‐old man with a past history of diabetes and hypertension
Syncope, melena, and hematochezia for the past 2 months
Recent unintentional weight loss
No recent travel
Lab: eosinophilia and a leukocytosis
PE and CT: splenomegaly without
lymphadenopathy
26. Ancillary test
項目
Peripheral smear
• Myelophthisic smear
• Anemia, thrombocytopenia, and atypical eosinophilia
• Hypogranular forms
Bone marrow biopsy
• Hypercellular marrow with marked eosinophilia
• Megakaryocytic atypia including pyknotic forms and atypical
nuclear to cytoplasmic ratios
• No increase in blasts
• Diffuse marrow fibrosis
Flow cytometry No increase in blasts or other aberrancies
Karyotyping Normal male karyotype
FISH
• MDS and t(9;22) was negative
• CHIC2 deletion
• negative for abnormalities of PDGFRB and FGFR1
30. Myeloid and lymphoid neoplasms with eosinophilia
• Bone marrow evaluation:
Hypercellular marrow with granulocyte hyperplasia and eosinophilia
Often with accompanying fibrosis
• Karyotyping can identify abnormalities of PDGFRB, FGFR1, and
PCM1‐JAK2
• 4q12 deletion (CHIC2) is usually seen with abnormalities of PDGFRA
Requiring FISH
• Treatment with imatinib results in an excellent response
32. Chronic myeloid leukemia, BCR‐ABL1‐positive
• Myeloproliferative neoplasms
Major proliferative component with granulocytes
Philadelphia chromosome
• Peripheral absolute basophilia and eosinophilia with left shift
• Marrow: Small megakaryocytes with hypolobated nuclei
Megakaryocyte hyperplasia or myeloid hyperplasia
Identify the chromosomal translocation
34. Systemic mastocytosis
• Major criteria
Multifocal, dense infiltrates of mast cells (≥15 mast cells in aggregates)
detected in sections of bone marrow and/or other extracutaneous organs
• Minor criteria
In biopsy or bone marrow aspirate smears, >25% of the mast cells in the
infiltrate are spindle‐shaped or have atypical morphology
Detection of an activating point mutation at codon 816 of KIT in mast cell
Mast cells in bone marrow, blood or other extracutaneous organ express CD25
with/without CD2 in addition to normal mast cell markers
Serum total tryptase persistently exceeds 20 ng/mL (unless there is an
associated myeloid neoplasm, in which case this parameter is not valid)
35. Systemic mastocytosis
• SM and neoplasms associated with eosinophilia can present with
similar clinicopathologic features
• Via detection of dense aggregates of mast cells with IHC
CD117 and/or mast cell tryptase, CD25, CD2
• The mast cells in SM are almost always CD25 positive and CD2
positive in two thirds of cases
36. Acute myeloid leukemia
• inv(16)(p13.1q22) or t(16;16) (p13.1;q22);CBFB‐MYH11
may also present with eosinophilia
• Unlike most cases of AML
Blast count of 20% is not required to render this diagnosis
• Increased blasts with monocytic differentiation
• Necessitating FISH analysis for diagnosis
CBFB‐MYH11
• Harlequin cell
38. Classic Hodgkin lymphoma
• B‐cell neoplasm composed of mononuclear Hodgkin cells and classic
Reed‐Sternberg cells
• Typically associated with lymphadenopathy
• Not infrequently presents with reactive, non‐clonal peripheral
eosinophilia
Utilizing IHC to diagnose CHL
• Hodgkin cells have a unique morphology and immunophenotype,
typically expressing CD30, CD15, and PAX5 (reduced)
39. Chronic myelomonocytic leukemia
• Features of both a MPN and a MDS
• Absolute monocytosis
Can be associated with peripheral eosinophilia as well
• In patients with CMML and prominent eosinophilia, abnormalities of
PDGFRB must be excluded
41. Approach to eosinophilia
• A detail history and review of system
Duration of the eosinophilia as well as associated B‐symptoms including fever, night sweats,
and unintentional weight loss
Travel and medication history
Skin rashes, lymphadenopathy, cardiorespira‐ tory symptoms, and gastrointestinal symptoms
• Physical exam
Rash, lymphadenopathy, and organomegaly
• Lab
Chest radiography, echocardiogram, serum troponins, and oxygen saturation assess
end‐organ damage
CBC/DC, metabolic panel, tryptase, ESR, CRP,Vit B12, IgE levels and/or allergy testing, PB
smear
42. Approach to eosinophilia
• Review CBC parameters and PB smear
Isolated eosinophilia reactive eosinophilia
Cytopenias, basophilia, circulating blasts, and/ or leukoerythroblastosis genetic and
molecular test
PB smear
• Eosinophil morphology atypia including hypogranulation, atypical segmentation, mature
eosinophils with atypical basophilic granules
• Granulocyte morphology dysplasia such as abnormal nuclear segmentation or
hypogranular cytoplasm
• Red cell morphology anisocytosis and poikilocytosis, including dacrocytes and/or circulating
nucleated red blood cells
• Platelet morphology abnormal changes in platelet number, granularity, and size
43. Next steps to take
• Bone marrow biopsy detecting hematologic malignancies, metastatic disease,
and potentially infections
• Flow cytometry
Increased blasts (but <20%) CEL
abnormalT‐cell population L‐HES
aberrant expression of CD25 and/or CD2 on mast cells SM, but CD25 positivity can be
seen in mast cells of myeloid/lymphoid neoplasms with eosinophilia and rearrangement
of PDGFRA, PDGFRB, or FGFR1, or with PCM1‐JAK2
• Immunohistochemistry
Mast cell v.s SM CD117 and/or mast cell tryptase
CD30,CD15, and PAX5 Classic Hodgkin lymphoma
44. Next steps to take
• Cytogenetic testing (including FISH and RT-PCR)
4q12 (PDGFRA), 5q31‐q33 (PDGFRB), 8p11‐12 (FGFR1), or 9p24 (JAK2) myeloid and
lymphoid neoplasms with eosinophilia
PDGFRA abnormalitiesCEL
PDGFRB abnormalities CMML
AML with inv(16)(p13.1q22) or t(16;16)(p13.1;q22);CBFB‐MYH11
• Molecular test (NGS)
TET2,ASXL1, and DNMT3A CEL
ASXL1,TET2, EZH2, and SETBP1 a subset of IHES
46. Key problem areas
• Many reactive causes of eosinophilia exist History!!!!
• Cryptic cytogenetic abnormalities including, but not limited to inv(16) and CHIC2
deletions, that cannot be identified through conventional karyotyping require
FISH or RT‐PCR analysis
• Lack of consensus criteria for the diagnosis of L‐HES closely follow up as they
may develop overt lymphoma
• Clonal molecular genetic abnormalities (ie, TET2, ASXL1, and DNMT3A) seen in
CEL, NOS can also be seen in a minority of elderly people in the absence of a
hematologic malignancy
48. Reference
• Rebecca L. Larsen, Natasha M. Savage. How I investigate Eosinophilia. Int J Lab
Hem. 2019;41:153–161.
• GildaVarricchi, Maria Rosaria Galdiero, et al.. Eosinophils:The unsung heroes in
cancer? Oncoimmunolog. 2018; 7(2): e1393134.
• N. Savage, et al. Myeloid neoplasms associated with eosinophilia and
rearrangement of PDGFRA,PDGFRB, and FGFR1: a review. 2013; 35(2): 491-500
• Teresa Scordino. Morphologic variants of normal cells. 2016
• LeonardNaymagon, et al. Eosinophilia in acute myeloid leukemia: Overlooked and
underexamined. 2019; 36: 23-31
48
Editor's Notes
Eosinophils are terminally differentiated granulocytes
5 day maturation
18-24hr circulation
eosinophilic myelocyte: the earliest recognizable eosinophilic form on light microscopy
positivity can be seen in mast cells of myeloid/lymphoid neoplasms with eosinophilia and rearrangement of PDGFRA, PDGFRB, or FGFR1, or with PCM1‐JAK2
Many reactive causes of eosinophilia exist, requiring a thorough history and laboratory workup to exclude secondary causes of eosinophilia, which are much more common than primary eosinophilia.
• Cryptic cytogenetic abnormalities including, but not limited to inv(16) and CHIC2 deletions, that cannot be identified through conventional karyotyping require FISH or RT‐PCR analysis. A pathologist must be familiar with these cryptic aberrations and when to appropriately order FISH analysis.
• Lack of consensus criteria for the diagnosis of L‐HES may result in diagnostic confusion and clinician uncertainty. Moreover, close follow‐up of these patients is needed as they may develop overt lymphoma during follow‐up necessitating more aggressive therapy.
• Clonal molecular genetic abnormalities (ie, TET2, ASXL1, and DNMT3A) seen in CEL, NOS can also be seen in a minority of elderly people in the absence of a hematologic malignancy and must be evaluated in the clinical context