title: Cytomorphologic features of immature ovarian teratoma in peritoneal effusion: a case report.
abstract: We describe unusual cytologic features of the peritoneal fluid in a patient with immature ovarian teratoma. Immature embryonal and neuroectodermal components of such tumors are rarely observed in the ascites; to our knowledge, there have been only three reports of cytologic findings of immature teratoma cells in the ascites. Our patient was a 26-yr-old woman who presented with a huge pelvic mass. A grade 3 immature right ovarian teratoma was diagnosed pathologically. Cytologic examination of the ascitic fluid revealed a variety of neoplastic cells, including immature neuroepithelial cells forming rosette-like structures, keratinized squamous cells, squamoid metaplastic cells, and immature glial-appearing cells. Immunohistochemical analysis revealed that immature gastrointestinal elements and yolk sac elements were positive for alpha-fetoprotein. This is the first description of the cytologic features of non-neuroepithelial elements in the ascitic fluid in a patient with immature ovarian teratoma.
authors.affiliation: Department of Pathology, Showa University Fujigaoka Hospital, Fujigaoka 1-30, Yokohama, Japan. kachu@mx2.ttcn.ne.jp
authors.forename: Katsuhide
authors.initials: K
authors.lastname: Ikeda
authors.forename: Genshu
authors.initials: G
authors.lastname: Tate
authors.forename: Takao
authors.initials: T
authors.lastname: Suzuki
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Mitsuya
mesh_terms: D000328:Adult; D001202:Ascitic Fluid / Q000737:chemistry / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007381:Intermediate Filament Proteins / Q000032:analysis; D053554:Keratin-20; D053552:Keratin-7; D007633:Keratins / Q000032:analysis; D009367:Neoplasm Staging; D010051:Ovarian Neoplasms / Q000378:metabolism / Q000473:pathology*; D013724:Teratoma / Q000378:metabolism / Q000473:pathology*; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D007381:Intermediate Filament Proteins; C507499:KRT20 protein, human; C507497:KRT7 protein, human; D053554:Keratin-20; D053552:Keratin-7; D000509:alpha-Fetoproteins; D007633:Keratins