title: Paraovarian cyst: MR imaging features.
abstract: BACKGROUND
  Paraovarian cysts are common intrapelvic neoplasms, but the magnetic resonance (MR) findings of paraovarian cyst have never been reported. We investigated the spectrum of MR imaging features of paraovarian cyst.
  
  
  METHODS
  MR images of 18 paraovarian cysts in 16 patients were reviewed retrospectively. MR images were evaluated for the size and location of paraovarian cysts, single or multicystic, signal intensity on T1- and T2-weighted images, and visualization of the normal ovary on the affected side.
  
  
  RESULTS
  The normal ovary of the affected side was recognized in 13 lesions. Four of these 13 cysts were separated from the ipsilateral ovary. In seven cysts, the normal ovary was abutted by cysts but maintained its shape. In two cysts, the beak sign was recognized at the interface between the cyst and the ovary. Most other MR features were nonspecific.
  
  
  CONCLUSIONS
  Most paraovarian cysts were homogeneous cystic masses near the ipsilateral round ligament and the uterus. Demonstration of a normal ipsilateral ovary close to, but separated from, the adnexal cyst may be an important MR finding for the diagnosis of paraovarian cysts.
authors.affiliation: Department of Radiology, Yamaguchi University School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kishimoto
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: H
authors.initials: H
authors.lastname: Awaya
authors.forename: N
authors.initials: N
authors.lastname: Matsunaga
authors.forename: E K
authors.initials: EK
authors.lastname: Outwater
authors.forename: E S
authors.initials: ES
authors.lastname: Siegelman
mesh_terms: D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010053:Ovary / Q000473:pathology; D010310:Parovarian Cyst / Q000175:diagnosis*; D012189:Retrospective Studies