Introduction: Thyroid is the endocrine organ situated in the midline of the neck.Its pathology varies from nutritional disorders like multinodular goiter to high grade malignancy like anaplastic carcinoma. Since the thyroid is superficially located and easily palpable, Fine needle aspiration cytology (FNAC) becomes the most common modality of investigation done for diagnosing thyroid lesions. The Bethesda system for reporting of thyroid cytology is most commonly used method for reporting FNAC of thyroid. Material and methods: It includes 100 cases of thyroid lesions. Results: All cases on FNAC reported as category II according to Bethesda system. On biopsy, all show features of multinodular goiter. Discussion: Category II should be sub categorized into IIA, IIB, IIC accordingly for Nodular, Lymphocytic thyroiditis and others respectively, as they have different pathogenesis, diagnostic modality and treatment protocol. Conclusion: Subcategorisation helps the clinicians to have distinct and well defined work up protocol for early diagnosis and treatment.

Keywords: Bethesda; Thyroid; Lymphocytes; Colloid.