title: Cerebral tumor with extensive rhabdoid features and a favorable prognosis.
abstract: This 32-year-old woman, 27 weeks pregnant, harbored a cystic mass with a solid component in the left frontal lobe. Histologically, the lesion was hypercellular and contained a diffuse sheet of eosinophilic cells of various sizes. The cells were almost round and had a few prominent, eccentrically placed, hyperchromatic nuclei of various sizes. Immunohistochemically, the tumor was reactive for vimentin, epithelial membrane antigen, cytokeratin AE1/AE3, smooth muscle actin, and BAF47/INI-1, and negative for glial fibrillary acidic protein, neurofilament protein, S100 protein, CK7, CK20, HMB-45, MIC2, and Bcl-2. The Ki 67 labeling index was 4.2%. Comparative genomic hybridization analysis revealed aberrations of the chromosomal copy number of +7 and -10. This tumor could not be categorized according to the present World Health Organization classification. Results of staining with glial fibrillary acidic protein were not consistent with a glioma, and staining with INI-1 was inconsistent with atypical teratoid/rhabdoid tumor. The tumor was therefore designated as a "cerebral tumor with extensive rhabdoid features."
authors.affiliation: Department of Neurosurgery, School of Medicine, Keio University, Tokyo, Japan. shigeo.ohba@gmail.com
authors.forename: Shigeo
authors.initials: S
authors.lastname: Ohba
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yoshida
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hirose
authors.forename: Eiji
authors.initials: E
authors.lastname: Ikeda
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nakazato
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawase
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D011247:Pregnancy; D011252:Pregnancy Complications, Neoplastic / Q000235:genetics / Q000473:pathology* / Q000601:surgery; D011379:Prognosis