Papillary thyroid carcinoma with atypical histiocytoid cells on fine‐needle aspiration

Although papillary thyroid carcinoma (PTC) usually has classic cytological characteristics on fine‐needle aspiration (FNA), it can present rarely with aberrant features resembling those of histiocytes in a cystic nodule. The aim of the current study was to describe PTC with atypical histiocytoid cells and distinguish it from benign histiocytes. A retrospective computerized search for FNAs with atypical features suggestive of PTC and cystic...