4. INTRODUCTION
❖ Ewing sarcoma is a rare type of cancer that occurs in bones or
in the soft tissue around the bones.
❖ It is an aggressive bone and soft-tissue cancer
In 1920,Dr,James Ewing described an unusual tumor in a 14-
year-old girl as a “diffuse endothelioma of bone.
5. Ewing sarcoma sites
❖ most often begins in the leg bones and in
the pelvis, but it can occur in any bone.
Bone (80%)
❖ Axial skeleton (45%) - Pelvis (20%) - Ribs
(10%)
Other axial bones (15%)
Distal skeleton (35%)
❖ Femur (12%) -Humerus (4%) - Other distal
bones (19%)
Ewing sarcoma sites-Metastasis
6. Main metastatic site are
❖ • Lungs
❖ • Bone
❖ • Bone marrow
Ewing sarcoma sites-Metastasis
7. ❖ Ewing sarcoma affects males more often than females.
It occurs primarily in
❖ children 0-10 yrs.
❖ and young adults, up to 20yrs.
❖ Consist 1% of all cancers in children and adolescents younger
than 15
❖ and 2% of all cancers in teens aged 15 to 19.
Ewing sarcoma incidence
8. Recently, doctors have defined the disease to include four types of
cancer, referred to as the Ewing's Family of Tumor (EFT). This
includes:
❖Ewing's sarcoma of bone
❖Ewing's sarcoma of soft tissue
❖Primitive neuroectodermal tumor (PNET) which may occur in
both bone and soft tissue
❖Askin's tumor, a PNET that occurs in the bones of the chest
The Ewing's Family of Tumor (EFT)
9. ❖ There is no known cause of Ewing's sarcoma.
The Ewing's Sarcoma Causes
Predispose by
10. ❖Over 90% of Ewing's sarcomas contain a t(11;22)(q24;q12) translocation
which fuses the EWS gene on chromosome 22 with the FLI1 gene on
chromosome 11. EWSR1-FLI1
❖This genetic feature defines the Ewing's family of tumors (Ewing's
sarcomas, peripheral primitive neuroectodermal tumours (pPNET) and
Askin's tumours).
Genetic abnormality in Ewing Family tumors
12. Clinical Symptoms and Signs
•Pain and enlarging mass associated with swollen soft tissue.
•Systemic symptoms.
•Pathologic fracture is infrequent.
•There is a need to improve diagnostic tests to identify Ewing’s
sarcoma.
13. Ewing sarcoma Diagnostic panel
❖Patient history
❖Clinical examination
❖CBC-ESR
❖Blood Tests- LFT,RFT.Mg++,Ca++,ALK. etc.
❖Cytogenetic tests-FISH,Karyotyping test
❖Molecular genetic tests-PCR
❖Biopsy
❖Radiological investigation
➢X-ray
➢CT Features
➢MRI Features
➢Bone Scan - Tumor and metastasis
➢Positron emission tomography (PET) scan
18. . (A) Atypical (large cell)
Histologic variation in Ewing sarcoma
(B) Areas with extensive
spindle cell features
may be seen
Spindle cell sarcoma is a soft
tissue tumor usually found in the
arm or leg bones, or in the
pelvis.
20. Ewing sarcoma of bone in a child. Plain radiograph shows
a mass in the metadiaphyseal region of the distal humerus.
Ewing sarcoma - Radiological investigation
22. What is the difference between Ewing
sarcoma and osteosarcoma?
Osteosarcoma and Ewing sarcoma have
different origins and come from different
cells.
This difference affects the
treatment used. For example,
radiation therapy is used more
often to treat Ewing sarcoma than
osteosarcoma.
