Cribriform‐morular variant of papillary thyroid carcinoma—Cytological and immunocytochemical findings of 18 cases

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<jats:title>Abstract</jats:title><jats:p>The purpose of this article was to describe cytologic findings of cribriform‐morular variant of papillary thyroid carcinoma (CMV‐PTC) in detail, to review previously reported cases, and to emphasize the diagnostic significance of this subtype. We examined 19 ultrasound‐guided fine needle aspiration (FNA) specimens from 18 CMV‐PTC patients. Cytologic features of CMV‐PTC were as follows, (1) hypercellularity, (2) papillary arrangement composed of tall columnar cells, (3) cribriform pattern, (4) morules, (5) spindle cells, (6) obscure ground‐glass nuclei, (7) peculiar nuclear clearing (PNC), (8) foamy or hemosiderin‐laden histiocytes, (9) hyaline materials, (10) absence of colloid in the background. The nuclear and cytoplasmic immunoreactivity of beta‐catenin and biotin‐positive PNC can indicate CMV‐PTC. We believe that cytologic diagnosis of CMV‐PTC is possible and it may lead to the early detection of polyposis coli. Diagn. Cytopathol. 2010;38:890–896. © 2010 Wiley‐Liss, Inc.</jats:p>

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