title: Choroidal cells in ovarian cyst fluid: a case report.
abstract: BACKGROUND
  The ovary is conspicuous for the wide diversity of histologic tumor types that it contains. Unusual or rare tumors may present diagnostic difficulty on cytologic examination.
  
  
  METHODS
  A 36-year-old woman presented with an 80-mm cystic lesion in the left ovary. Fine needle aspiration provided 30 ml of transparent, light yellow fluid. On cytologic examination, numerous clusters and rosettes of benign cells, resembling choroid plexus cells, were seen. Surgical resection confirmed the presence of an ependymal cyst adjacent to a mature cystic teratoma (dermoid cyst).
  
  
  CONCLUSIONS
  We report this unique case in order to alert cytologists unfamiliar with cerebrospinal fluid cytopathology to the rare entity of ovarian ependymal cysts.
authors.affiliation: Department of Cytology, Royal Women's Hospital and Royal Melbourne Hospital, Australia.
authors.forename: N J
authors.initials: NJ
authors.lastname: Mulvany
authors.forename: P
authors.initials: P
authors.lastname: Allan
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D002831:Choroid Plexus / Q000166:cytology*; D003884:Dermoid Cyst / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D010048:Ovarian Cysts / Q000473:pathology*; D010051:Ovarian Neoplasms / Q000473:pathology