title: An unusual presentation of struma ovarii mimicking a malignant process.
abstract: BACKGROUND
  Struma ovarii is a rare form of ovarian neoplasm, composed entirely or predominantly of thyroid tissue. This tumor is generally benign, although malignant transformation has been reported.
  
  
  METHODS
  We report an unusual presentation of a postmenopausal woman with benign struma ovarii associated with a large amount of ascites, a markedly elevated CA 125 serum level, and a large complex pelvic mass thereby mimicking an ovarian cancer.
  
  
  CONCLUSIONS
  This case serves to remind clinicians that clinical features highly suspicious for ovarian cancer do not necessarily confirm a malignancy.
authors.affiliation: The Division of Gynecologic Oncology, The Chao Family Comprehensive Cancer Center, University of California, Irvine Medical Center, Orange, California 92868, USA.
authors.forename: Vera
authors.initials: V
authors.lastname: Loizzi
authors.forename: Fabio
authors.initials: F
authors.lastname: Cappuccini
authors.forename: Michael L
authors.initials: ML
authors.lastname: Berman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001201:Ascites / Q000097:blood; D018394:CA-125 Antigen / Q000097:blood; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000175:diagnosis*; D013330:Struma Ovarii / Q000175:diagnosis*
chemical_list: D018394:CA-125 Antigen