title: MR appearance of parasymphseal insufficiency fractures of the os pubis.
abstract: OBJECTIVE
  To clarify the MRI features of parasymphyseal insufficiency fractures of the os pubis.
  
  
  METHODS
  MRI was performed in four postmenopausal women with parasymphyseal insufficiency fractures. The diagnosis was confirmed with plain films in every patient. T1-weighted and T2-weighted images were obtained in four patients using a 1.5-T unit. Postcontrast T1-weighted imaging was also done in three patients.
  
  
  CONCLUSIONS
  MRI of pubic parasymphyseal insufficiency fracture characteristically demonstrates a hyperintense mass lesion with a hypointense rim on T2-weighted imaging, showing peripheral and septal enhancement after contrast administration. It is important to have this entity in mind in patients with osteoporosis, especially in patients with a history of pelvic irradiation for malignant disease, so as not to misinterpret it as a chondroid tumor or bone metastasis.
authors.affiliation: Department of Nuclear Medicine, Faculty of Medicine, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hosono
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi
authors.forename: R
authors.initials: R
authors.lastname: Fujimoto
authors.forename: K
authors.initials: K
authors.lastname: Tsutsui
authors.forename: Y
authors.initials: Y
authors.lastname: Kotoura
authors.forename: T
authors.initials: T
authors.lastname: Tsuboyama
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: J
authors.initials: J
authors.lastname: Konishi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D015775:Fractures, Stress / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010024:Osteoporosis / Q000150:complications; D011631:Pubic Symphysis / Q000293:injuries* / Q000473:pathology; D011832:Radiation Injuries / Q000150:complications; D014594:Uterine Neoplasms / Q000532:radiotherapy
chemical_list: D003287:Contrast Media