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Background: Thyroid fine needle aspiration cytology (FNAC) is an important diagnostic tool for thyroid disorders. The Bethesda technique for Reporting Thyroid Cytopathology (TBSRTC) is an unambiguous, six-category reporting system for thyroid fine needle aspiration (FNA) that is widely acknowledged as a standard reporting guideline for institutes across continents which can minimize needless surgeries. Material and Methods: The study was carried out at the Pathology Department of the Assam Medical College and Hospital, Dibrugarh, Assam, India, from March 2023 to February 2024. The aim is to study the different cytological pattern in thyroid lesion by FNAC The results are interpreted using the features and categories specified in the TBSRTC. A total of 182 cases were studied. The distribution of the various categories from evaluated thyroid FNAs are as follows: nondiagnostic/unsatisfactory-8.2%, benign-75.9%, atypia of undetermined significance-6.0%,follicular neoplasm (FN) or suspicious for a FN-4.3%,suspicious for malignancy - 1%, malignant - 4.3%.Conclusion: The results of a FNA according to The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) give a standard and systematic approach to managing these nodules. Its standardized nomenclature enhanced thyroid FNAC reporting by facilitating communication and interlaboratory agreement among cytopathologists and clinicians, potentially leading to more standardized patient care management. [ABSTRACT FROM AUTHOR]