Abstract
<b>Objectives:</b> To evaluate the results of fine needle aspiration cytology (FNAC) in the diagnosis and management of thyroid lesions.<br><b>Materials and Methods:</b> A review was conducted of FNAC of diffuse or nodular thyroid lesions performed on 434 patients over a period of three years. The cytological results were correlated with clinical features, biochemical investigations, and subsequent histopathological examination and management of the patients.<br><b>Results:</b> The most frequently encountered lesion was the colloid goiter in 250 (57.60%) cases followed by thyroiditis in 119 (27.41%) cases, ten (2.30%) adenomatous goiters and two (0.004%) thyroglossal cysts. In the neoplastic group, 14 (1.38%) cases were reported as follicular/Hurthle cell neoplasms and 17 (3.91%) as malignant tumors. When compared with the clinical diagnosis, FNAC proved to be an improvement on the diagnosis of thyroiditis and malignancy when compared with that of goiter. FNA revealed a sensitivity of 97%, a specificity of 100%, a positive predictive value of 96% and a negative predictive value of 100%.<br><b>Conclusions:</b> FNAC is a minimally invasive, highly accurate and cost-effective procedure for the assessment of patients with thyroid lesions. It also helps in differentiating lesions that require surgery from those that can be managed otherwise.
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