title: Transvaginal sonographic appearance of hemorrhagic functional ovarian cysts and their spontaneous regression.
abstract: OBJECTIVE
  To obtain information on the characteristic feature of transvaginal sonograms of hemorrhagic functional ovarian cysts (HFOCs) and their natural course.
  
  
  METHODS
  Thirty-four cases of suspected HFOC based on our tentative criteria were ultrasonically followed-up for 3 months. After the study period, the sonographic findings and their changes with time were analyzed.
  
  
  RESULTS
  Twenty-four cases were clinically diagnosed as HFOCs, as the masses disappeared naturally. At the first examination, 5 cases (20.8%) showed a diffuse echogenic pattern which seems to consist of a blood clot, 9 (37.5%) were mixed pattern with a clearly demarcated solid part, 3 (12.5%) were hyperechoic sponge-like reticular pattern and 7 (29.2%) were cysts including vague echo inside which looked cotton-like. Seven masses (29.2%) disappeared within 2 weeks and the remaining had a different sonographic appearance with time until they disappeared finally within 8 weeks.
  
  
  CONCLUSIONS
  HFOCs show the characteristic changes in transvaginal sonographic appearance and can be diagnosed by short-term follow-up.
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Okai
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: E
authors.initials: E
authors.lastname: Ryo
authors.forename: H
authors.initials: H
authors.lastname: Kagawa
authors.forename: S
authors.initials: S
authors.lastname: Kozuma
authors.forename: Y
authors.initials: Y
authors.lastname: Taketani
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D010048:Ovarian Cysts / Q000000981:diagnostic imaging* / Q000453:epidemiology; D010053:Ovary / Q000000981:diagnostic imaging*; D012075:Remission, Spontaneous; D013997:Time Factors; D014463:Ultrasonography