This document discusses lymph node impression smear cytology, a technique used to identify the cause of lymphadenopathy. It involves collecting a lymph node, making a smear of its cut section on a slide, staining it, and examining it under a microscope. The cells normally seen include small and large lymphocytes, plasma cells, and macrophages. Various disease conditions can be identified based on the abnormal cell types and proportions seen, such as reactive hyperplasia characterized by small lymphocytes, lymphoma showing proliferating neoplastic lymphocytes, and lymphadenitis with increased inflammatory cells. Metastatic neoplasms can also be detected by the presence of abnormal cell types within the lymph node.

1. Topic: Lymph Node Impression Smear Cytology
By: Dr Zaid Wani

2. Introduction
• Useful tool to identify the underlying cause of
lymphadenopathy.
• Used as a diagnostic technique.
• Helps in distinguishing between Hyperplasia, Lymphoma,
Lymphadenitis, infectious agents, reactive nodes and
metastatic neoplasm.
• Enlargement of any lymph node is indication for
cytological examination.

3. Technique
• Collect a lymph node.
• Immediate examination is preferred , with accurate
results or it can be stored in refrigerator under suitable
temperature and examined when necessary.
• If taken from refrigerator, Thawing is done first.
• Make a cut section of the lymph node .
• Take a clean slide and touch it over the cut section of the
lymph node, forming a smear.
• Let the smear dry.

4. Staining
• Cover the slide with Leishman Giemsa stain.
• Keep it for 2 minutes.
• Double dilute with equal amount of water .
• Gently blow air over the slide to mix the stain and water.
• Keep for 20 minutes .
• Wash the slide under running tap water.
• Examine under high power microscope for cytology.

5. Cells derived from Lymph
Nodes
• Small lymphocytes:
Predominant (>80% of
total cell population)
• Large lymphocytes: less in
number (<20%)
• Plasma cells: Few in
number
• Lysed cells: Lysed
lymphocytes due to forced
aspiration.
• Other cells: Macrophages
Mast cells
Reticular cells

6. Disease Conditions Affecting
Lymph Nodes
Reactive Lymphoid
Hyperplasia:
• Small lymphocytes
predominate
• Large lymphocytes
and some plasma
cells may constitute
upto 20%.

7. Lymphoma:
• Proliferation of
neoplastic lymphocytes
as a result of maturation
arrest.
• Neoplastic population
>50% of lymphoid
population
• Tingible body
macrophages and
lympho-glandular bodies
are seen.

8. Lymphadenitis:
• Increased number of
leukocytes
(Neutrophils)
• Characterized by
predominant
inflammatory cell type
• Types:
Suppurative
Granulomatous
Eosinophillic

9. Metastatic neoplasm:
• More common with
epithelial/glandular
tumors.
• Metastatic cells are
identified as canon ball
like focal areas of cells or
individual cells not
normally associated with
lymph nodes. Angular epithelial cells with
abundant cytoplasm do not belong
in a lymph node under any
circumstance

10. Inference
Sample Species Age (years) Place Result
Mesenteric
Lymph Node Goat
1 Pondicherry
Normal: No
immature or
inflammatory
cells were
observed.
4 Hyderabad
2 Pondicherry
2 Pondicherry
1 Pondicherry

11. THANK YOU