CLINICAL HISTORY : Thyroid nodule in right lobe . CLINICAL IMPRESSION : R / O Malignancy . MICROSCOPIC : Sonography guided FNA from right lobe reveals hypercellular smears containing many lymphocytes and rare clusters of benign follicular cells in bloody background . DIAGNOSIS : Thyroid gland , right lobe , sonography guided FNA : Consistent with Hashimoto's thyroiditis , category II , Bethesda system .