title: Sonographic value in diagnosis of hemorrhagic ovarian cysts.
abstract: OBJECTIVE
  To investigate the sonographic characteristics of hemorrhagic ovarian cysts (HOC) and to avoid unnecessary surgery.
  
  
  METHODS
  113 cases of suspected HOC underwent sonographic and clinical follow-up for three months.
  
  
  RESULTS
  104 cases were clinically diagnosed with HOC as the masses disappeared naturally. The mean length of the greatest diameter was 5.12 +/- 1.33 cm, and the mean period of disappearance was 3.5 +/- 2.4 weeks. There were four patterns of the image: 21 cases (20.2%) showed a diffused dense echo pattern, 25 cases (24.0%) displayed a mixed pattern, 30 cases (28.8%) expressed a sponge-like pattern and 28 cases (27.0%) exhibited a cystic pattern. Ring blood flow with high velocity and low resistance was detected in 41 cases (40%) and there was no internal blood flow.
  
  
  CONCLUSIONS
  HOC showed characteristic features on sonography, which provided useful information to differentiate HOC from ovarian tumors.
authors.affiliation: Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Ding
authors.forename: D
authors.initials: D
authors.lastname: Zhang
authors.forename: W
authors.initials: W
authors.lastname: Ying
authors.forename: J
authors.initials: J
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006470:Hemorrhage / Q000000981:diagnostic imaging* / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D010048:Ovarian Cysts / Q000150:complications / Q000000981:diagnostic imaging*; D014463:Ultrasonography; D055815:Young Adult