Pituicytoma: Characterization of a unique neoplasm by histology, immunohistochemistry, ultrastructure, and array-based comparative genomic hybridization

Joanna J. Phillips, Anjan Misra, Burt G. Feuerstein, Sandeep Kunwar, Tarik Tihan

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

The pituicytoma is a rare neoplasm whose histogenesis is debated partly because of the diversity of tissue types present in the sellar region. In this article we illustrate the characteristic histologic, immunohistologic, and ultrastructural features of this unique neoplasm. Furthermore, we use array-based comparative genomic hybridization to demonstrate a unique pattern of genomic copy number aberrations in pituicytomas. Tumors were composed of bipolar, spindle cells that were immunopositive for S100, vimentin, and Bcl-2 and immunonegative for synaptophysin, chromogranin, and glial fibrillary acidic protein. Ultrastructural analysis was remarkable for absence of secretory granules. Array comparative genomic hybridization demonstrated genomic copy number imbalances, including losses on chromosome arms 1p, 14q, and 22q and gains on 5p. This pattern of genetic changes only partially overlaps with the genomic alterations reported in pituitary adenomas. In summary, our data suggest that pituicytomas are a unique subset of tumors of the sellar region.

Original languageEnglish (US)
Pages (from-to)1063-1069
Number of pages7
JournalArchives of Pathology and Laboratory Medicine
Volume134
Issue number7
StatePublished - Jul 1 2010

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Medical Laboratory Technology

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