title: Ovarian torsion: CT and MR imaging appearances.
abstract: OBJECTIVE
  To describe the features of twisted ovarian tumors on computed tomographic (CT) scans and magnetic resonance (MR) images.
  
  
  METHODS
  The CT scans, MR images, clinical records, and histopathologic findings in 10 patients with surgical proof of a twisted adnexal tumor were retrospectively evaluated.
  
  
  RESULTS
  The most common findings on MR images were nonspecific: deviation of the uterus to the twisted side (n = 9), engorged blood vessels on the twisted side (n = 6), a small amount of ascites (n = 5), and obliteration of fat (n = 4). The following characteristics were seen only in the five patients with hemorrhagic infarction: (a) a protrusion of the lesion on the twisted side to which the uterus was continuous or engorged blood vessels converged (n = 5); (b) thick, straight blood vessels that draped around the lesion (n = 2); (c) distinct hematoma (n = 2); and (d) complete absence of enhancement (n = 3).
  
  
  CONCLUSIONS
  Three findings (a, b, and d) seem to be diagnostic of the twisted adnexal tumor and may facilitate prompt surgical intervention at examination with MR imaging or CT.
authors.affiliation: Department of Radiology, Kyoto University, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Togashi
authors.forename: S
authors.initials: S
authors.lastname: Kawakami
authors.forename: K
authors.initials: K
authors.lastname: Takakura
authors.forename: T
authors.initials: T
authors.lastname: Mori
authors.forename: J
authors.initials: J
authors.lastname: Konishi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D006801:Humans; D007238:Infarction / Q000175:diagnosis / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010049:Ovarian Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D010051:Ovarian Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging; D010053:Ovary / Q000098:blood supply; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014102:Torsion Abnormality