title: The Mechanism Causing High-signal Intensity on Diffusion-weighted Imaging in Adnexal Torsion: Two Case Reports.
abstract: We report two cases with adnexal torsion to assess the mechanism of very strong signal intensity in ovarian lesions on DW imaging using MR imaging such as T2*-weighted imaging. MR imaging findings of the cases suggest that the very strong signal intensity on DW imaging is contributed to cytotoxic edema with or without vasogenic edema, as well as oxyhemoglobin or extracellular methemoglobin.
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University.
authors.forename: Shinya
authors.initials: S
authors.lastname: Fujii
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University.
authors.forename: Naoko
authors.initials: N
authors.lastname: Mukuda
authors.affiliation: Division of Organ Pathology, Department of Pathology, Faculty of Medicine, Tottori University.
authors.forename: Kanae
authors.initials: K
authors.lastname: Nosaka
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University.
authors.forename: Takeru
authors.initials: T
authors.lastname: Fukunaga
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University.
authors.forename: Chie
authors.initials: C
authors.lastname: Inoue
authors.affiliation: Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University.
authors.forename: Toshihide
authors.initials: T
authors.lastname: Ogawa
mesh_terms: D000291:Adnexal Diseases / Q000000981:diagnostic imaging*; D000368:Aged; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D004487:Edema / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D010049:Ovarian Diseases / Q000000981:diagnostic imaging*; D014102:Torsion Abnormality / Q000000981:diagnostic imaging*
keywords: T2*-weighted imaging; diffusion-weighted magnetic resonance imaging; magnetic resonance imaging; ovarian; ovary