Introduction: The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) provides a standardized
framework for classifying thyroid nodule fine-needle aspiration (FNA) cytology results in management and risk
stratification of thyroid nodules. Despite its utility, Indeterminate Categories pose diagnostic challenges. Immunocytochemistry (ICC) offers
potential solutions by using specific markers to distinguish between benign and malignant nodules. 1. Objectives: Analyze the cytological
features and group the thyroid cytopathological reports based on the diagnostic criteria of Bethesda system for reporting thyroid cytopathology.
2. Use of immunocytochemistry (CK-19 and Galectin 3) for differential diagnosis of Indeterminate follicular patterned thyroid smears and
whenever required for the diagnosis. 3. Analyze whether cytopathological diagnosis correlated with the histopathological diagnosis in cases
where biopsy specimens were available. A cross-sectional study was done on 143 patients with thyroi Methods: d nodule. FNA was done on all
the patients and cytological diagnosis were made by using TBSRTC and ICC was performed on Indeterminate Categories (III, IV, V) and
histopathological correlation was done in cases wherever the surgical specimens were received. All Results: the patients were diagnosed
according TBSRTC. Out of 143 patients Category I included 5 cases, Category II included 104 cases, Category III included 11 cases, Category IV
included 12 cases, Category V included 6 cases, Category VI included 5 cases. On Category III, IV, V, ICC was done to differentiate Benign
lesions from Malignant lesions and histopathological correlation was done. ROM was calculated for every Category. TBSRTC was Conclusion:
reliable and reproducible and its diagnostic accuracy was increased by using ICC in conjugation with it.