Fine needle aspiration cytology of papillary carcinoma thyroid with Hashimoto's thyroiditis--report of two cases.

Two cases of papillary carcinoma of thyroid with clinically unsuspected Hashimoto's thyroiditis were diagnosed on Fine Needle Aspiration Cytology (FNAC) in females aged 22 yrs, and 57 yrs., who presented with a solitary thyroid nodule. The frequency of carcinoma in Hashimoto's thyroiditis varies between 0.5 to 23.7%, depending on the stringency of diagnostic criteria applied. We believe that this possibility must be kept in mind when ever an aspirate of a solitary nodule shows profuse lymphocytes and Hurthle cells.