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Preparation and Using Phantom Lesions to Practice Fine Needle Aspiration Biopsies
Published on: September 29, 2009
Comparative Evaluation of Routine and Special Staining Techniques in Fine Needle Aspiration Cytology of Lymph Nodes
Ramis Khan1, Areeba Nasar2, Arun Kumar Yadav1
1Pathology, Madhav Prasad Tripathi Medical College, Siddharthnagar, IND.
Insights
Fine needle aspiration cytology (FNAC) combined with special stains and immunocytochemistry significantly improves diagnostic accuracy for lymph node infections and cancers. Auramine-rhodamine staining is more sensitive for detecting tuberculosis than Ziehl-Neelsen, aiding early diagnosis in resource-limited settings.
Area of Science:
- Pathology
- Cytology
- Infectious Diseases
- Oncology
Background:
- Fine needle aspiration cytology (FNAC) is a standard diagnostic tool for lymphadenopathy.
- Malignancies and tuberculosis (TB) are common causes of lymph node enlargement in developing countries.
- Routine cytology stains may lack sensitivity for certain infections and neoplastic conditions.
Purpose of the Study:
- To compare the diagnostic efficacy of routine and special staining methods in FNAC of lymph nodes.
- To evaluate the utility of immunocytochemistry in conjunction with FNAC for lymphadenopathy diagnosis.
- To assess the sensitivity of auramine-rhodamine versus Ziehl-Neelsen stains for tuberculosis detection in lymph node aspirates.
Main Methods:
- An observational study involving 104 patients with lymphadenopathy undergoing FNAC.
- Application of routine (H&E, Giemsa), special (ZN, AR, PAS), and immunocytochemistry (CD15, CD45) stains.
- Statistical analysis using Chi-square test, Cohen's kappa, and sensitivity/specificity measures.
Main Results:
- Reactive lymphadenitis was the most common diagnosis (57.7%).
- Auramine-rhodamine detected acid-fast bacilli in 27.8% of suspected TB cases, compared to 11.1% with Ziehl-Neelsen.
- Malignancy was diagnosed in 7.7% of cases, with strong agreement between clinical suspicion and cytological diagnosis (Cohen's kappa = 0.754).
Conclusions:
- Integrating FNAC with special stains and immunocytochemistry enhances diagnostic accuracy for infectious and neoplastic lymphadenopathy.
- Auramine-rhodamine staining demonstrates superior sensitivity for TB detection compared to Ziehl-Neelsen.
- This comprehensive approach is crucial for timely and accurate diagnosis, especially in resource-limited settings.
Background And Objective:
Fine needle aspiration cytology (FNAC) is a fast, inexpensive, and least invasive form of diagnosis, which is commonly used in the assessment of lymphadenopathy. In developing nations such as India, malignancies and tuberculosis (TB) are some of the most frequent causes of the enlargement of the lymph nodes. Although regular cytology stains are commonly used, they are not always sensitive to some infections and neoplastic diseases. The objectives of this research were to compare and evaluate diagnostic using routine and special staining methods in FNAC of lymph nodes.
Methods:
This is an observational study conducted over 18 months in the Department of Pathology at Era's Lucknow Medical College. A total of 104 patients with lymphadenopathy who were subjected to FNAC were enrolled. Routine (hematoxylin and eosin (H&E) and Giemsa), special (Ziehl-Neelsen (ZN), auramine-rhodamine (AR), and periodic acid-Schiff (PAS)), and immunocytochemistry (ICC) (CD15 and CD45) stains were used to stain aspirates. SPSS version 18 (IBM Corp., Armonk, NY) was used to analyze the diagnostic findings by applying the Chi-square test, Cohen's kappa, and adjusted sensitivity and specificity measures.
Findings:
Reactive lymphadenitis was the most frequent cytological diagnosis, observed in 60 cases (57.7%), followed by granulomatous lymphadenitis in 23 cases (22.1%). Among the 36 cases suspected of tuberculosis on cytomorphology, auramine-rhodamine staining detected acid-fast bacilli (AFB) in 10 cases (27.8%), whereas Ziehl-Neelsen staining was positive in only four cases (11.1%). Malignancy was diagnosed in eight cases (7.7%). Immunocytochemistry revealed CD45 positivity in two of the malignant cases (25%) and CD15 positivity in one case (12.5%). Agreement between clinical suspicion and cytological diagnosis of malignancy was strong (Cohen's kappa = 0.754).
Conclusion:
FNAC used in conjunction with special stains and immunocytochemistry is much more effective in increasing diagnostic accuracy in infectious and neoplastic lymphadenopathy. Auramine-rhodamine was more sensitive than TB-Ziehl-Neelsen. This integrative methodology plays an essential role in proper and early diagnosis, particularly in resource-limited environments.
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