title: Usefulness of T2*-weighted MRI in the detection of adnexal torsion.
abstract: BACKGROUND
  The usefulness of T2*-weighted (T2*W) imaging for the detection of adnexal torsion has yet to be determined.
  
  
  OBJECTIVE
  To assess the usefulness of T2*W imaging for detecting and differentiating adnexal torsion.
  
  
  METHODS
  Eight patients with eight ovaries with torsion and 44 patients with 72 ovaries without torsion were included in this study. All patients underwent 1.5-T magnetic resonance imaging (MRI) including T2*W images. The frequency and distribution of hypointensity on T2*W images were compared between ovaries with torsion and ovaries without torsion.
  
  
  RESULTS
  Hypointensity on T2*W images was significantly more frequent in ovaries with torsion than in ovaries without torsion (75% vs. 36%; P < 0.05). Among patients with hypointensity on T2*W images, the frequency of diffuse hypointensity was significantly higher in ovaries with torsion than in ovaries without torsion (83% vs. 0%; P < 0.01); whereas the frequency of focal hypointensity was significantly lower in ovaries with torsion than in ovaries without torsion (17% vs. 100%; P < 0.01).
  
  
  CONCLUSIONS
  The presence and distribution of hypointensity on T2*W images may play a supplementary role in the detection of adnexal torsion.
authors.affiliation: Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kawai
authors.affiliation: Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kato
authors.affiliation: Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kanematsu
authors.affiliation: Department of Radiology, Gifu Municipal Hospital, Gifu, Japan.
authors.forename: Shimpei
authors.initials: S
authors.lastname: Kawaguchi
authors.affiliation: Department of Radiology, Gifu Municipal Hospital, Gifu, Japan.
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Kojima
authors.affiliation: Department of Obstetrics and Gynecology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Furui
authors.affiliation: Department of Obstetrics and Gynecology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Ken-Ichirou
authors.initials: K
authors.lastname: Morishige
authors.affiliation: Department of Radiology, Gifu University School of Medicine, Gifu, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Matsuo
keywords: Adnexal torsion; T2*-weighted images; magnetic resonance imaging (MRI)