XXXX with rhabdoid features.

@entity5953 @entity4166 @entity2940 @entity10922 @entity39 @entity5 @entity1326 @entity4206 @entity6195 @entity5606 @entity2279 @entity6578 @entity1325 @entity16412 @entity3745 @entity15529 @entity2867 @entity1374
UNASSIGNED: @entity2867 ( @entity2867 ) is a rare, highly aggressive @entity5 , characterized by complete or partial composition by undifferentiated cells. We report a case of @entity2867 with rhabdoid features in a 68-year-old male, who presented with a rapidly enlarging neck mass. Fine-needle aspiration (FNA) of the @entity1374 showed discohesive, pleomorphic round to polygonal rhabdoid cells with one to multiple eccentric, large, rounded nuclei with a prominent nucleolus, moderate to abundant, globoid cytoplasm which oftentimes harbor a pale para-nuclear inclusion. The cytoplasm of some cells contained variously sized, eosinophilic granules. Rare cells contained neutrophils in their cytoplasm. Mitoses including atypical @entity6578 and @entity39 were readily seen. Histologic examination of needle core biopsy (NCB) revealed individual dispersed and sheets of pleomorphic neoplastic cells with similar cytomorphologic features as described above. The @entity5 extensively infiltrated a myxocollagenous stroma containing lymphocytes and neutrophils, and demonstrated foci of @entity39 . @entity5 cells were immunoreactive for keratins @entity1325 / @entity1326 , CAM5.2, and @entity4166 ; @entity15529 , and @entity4206 , but negative for S-100, HMB-45, calcitonin, @entity10922 , @entity3745 , @entity2940 , @entity16412 , @entity5953 , myogenin, @entity2279 , and @entity6195 . The differential diagnosis of this @entity5606 is discussed. Diagn. Cytopathol. 2015.    2015 Wiley Periodicals, Inc.
