title: Ultrasonographic appearance of an echinococcus ovarian cyst.
abstract: BACKGROUND
  We describe the ultrasonographic pattern of a pelvic echinococcus cyst, visualized using a vaginal probe and color Doppler.
  
  
  METHODS
  A 27-year-old woman presented with an asymptomatic right adnexal mass. Vaginal ultrasonography revealed a cyst in the posterior cul-de-sac, adjacent to the right ovary, with internal septae resembling a maze or an onion slice structure. Color Doppler revealed peripheral vascularization with a low resistance pattern (resistance index 0.6; pulsatility index 0.93). Benign cysts usually have a simple echogenic pattern. In contrast, ovarian carcinomas have a complex internal structure.
  
  
  CONCLUSIONS
  Ovarian echinococcus cysts may have a peculiar ultrasonographic pattern at high-frequency (7.5-MHz) vaginal ultrasonography. Such high-frequency ultrasonography can be a useful tool in the diagnosis of the disease.
authors.affiliation: Department of Obstetrics and Gynecology, Fundación Jiménez Díaz, Madrid, Spain. jdiaz-recasens@fjd.es
authors.forename: J
authors.initials: J
authors.lastname: Díaz-Recaséns
authors.forename: A
authors.initials: A
authors.lastname: García-Enguídanos
authors.forename: I
authors.initials: I
authors.lastname: Muñoz
authors.forename: R
authors.initials: R
authors.lastname: Sáinz de la Cuesta
mesh_terms: D000328:Adult; D004443:Echinococcosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D010048:Ovarian Cysts / Q000000981:diagnostic imaging*; D014463:Ultrasonography