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MR appearance of parasymphseal insufficiency fractures of the os pubis
M Hosono1, H Kobayashi, R Fujimoto
1Department of Nuclear Medicine, Faculty of Medicine, Kyoto University, Japan.
Objective:
To clarify the MRI features of parasymphyseal insufficiency fractures of the os pubis.
Design And Patients:
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.
Results And 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.