title: A case of estrogen-producing Brenner tumor with a stromal component as a potential source for estrogen.
abstract: BACKGROUND
  Although Brenner tumors with endocrine activities have been reported, the source or mechanisms for hormone production is poorly known at present.
  
  
  METHODS
  A 66-year-old Japanese woman presented with atypical vaginal bleeding. A left ovarian tumor was detected on ultrasonography and CT scanning. Her serum estradiol level was elevated (73.5 pg/ml). We performed total hysterectomy, bilateral salpingo-oophorectomy and partial omentectomy. The ovarian tumor was diagnosed as a benign Brenner tumor associated with simple hyperplasia of the endometrium. Postoperatively, the serum estradiol level decreased. Immunoreactivity of cytochrome P-450 aromatase was detected in stromal cells.
  
  
  CONCLUSIONS
  Stromal contribution to the secretion of estrogen was shown in this case. Considering the known source of estrogen production being tumor cells in certain cases of Brenner tumor, there seem to be two types of estrogen-producing Brenner tumors depending on the source of estrogen, i.e. tumor cells or stromal cells.
authors.affiliation: Department of Obstetrics and Gynecology, Hitachi General Hospital, Ibaraki, Japan.
authors.forename: Hisahiko
authors.initials: H
authors.lastname: Hiroi
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Osuga
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Tarumoto
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Shimokama
authors.forename: Tetsu
authors.initials: T
authors.lastname: Yano
authors.forename: Harushige
authors.initials: H
authors.lastname: Yokota
authors.forename: Yuji
authors.initials: Y
authors.lastname: Taketani
mesh_terms: D000368:Aged; D044466:Asian People; D001948:Brenner Tumor / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D004958:Estradiol / Q000097:blood*; D004967:Estrogens / Q000032:analysis*; D005260:Female; D006801:Humans; D007564:Japan; D010051:Ovarian Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D010298:Parity; D017154:Stromal Cells / Q000473:pathology; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography
chemical_list: D004967:Estrogens; D004958:Estradiol