BACKGROUND: We report the first case of a composite @entity5 (tall cell and columnar cell variants) of @entity3557 ( @entity3557 ) diagnosed by fine needle aspiration. It is important to differentiate these uncommon @entity146 variants from the usual indolent @entity1377 . CASE: Fine needle aspiration cytology was obtained from a rare composite @entity5 of tall cell and columnar cell variants of @entity3557 . The smears showed a cellular aspirate with scattered @entity5 cells and several tissue fragments arranged in a papillary pattern. The @entity5 cells had abundant nuclear grooves and intranuclear pseudoinclusions. Several of the fragments showed columnar cells with nuclear pseudostratification, and a few clusters displayed tall columnar cells with basal nuclei and abundant cytoplasm. A rare cluster exhibited composite features of tall cell and columnar cell variants. CONCLUSION: Columnar cell and tall cell variants of @entity3557 manifest @entity146 clinical behavior. The differential diagnosis of columnar cell variant includes @entity189 of thyroid and metastatic @entity420 . Immunohistochemical stains for @entity175 and thyroglobulin play an important role in difficult cases. The tall cell variant needs to be differentiated from H  rthle cell papillary neoplasm of thyroid, which displays prominent nucleoli and lacks the characteristic nuclear features of @entity3557 . The preoperative diagnosis of these @entity146 variants' is important in planning the most appropriate type of treatment.

Fine needle aspiration cytology of mixed tall and columnar cell XXXX of the thyroid. A case report.

@entity3557 :: ('MESH:C536915', 'Disease') :: ['papillary thyroid carcinoma', 'PTC'] @entity1377 :: ('MESH:D002291', 'Disease') :: ['papillary carcinomas'] @entity175 :: ('MESH:D002116', 'Chemical') :: ['calcitonin'] @entity146 :: ('MESH:D001523', 'Disease') :: ['aggressive'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'single tumor'] @entity189 :: ('MESH:D002277', 'Disease') :: ['medullary carcinoma'] @entity420 :: ('MESH:D000230', 'Disease') :: ['adenocarcinoma']
@entity1377 :: (MESH:D002291,Disease) :: ['papillary carcinoma']
