Fig. 10
From: Pelvic heterotopic ossification: when CT comes to the aid of MR imaging
A 35-year-old male patient with leg contractures, affected by posterior element incomplete fusion (spina bifida occulta). a MR T1-weighted axial images evidence a soft tissue abscess (small arrow) of the perineal region related to pressure sores. Lesion is determining a certain retraction over the superficial layers of the dermis. b STIR images show the focal inflammatory lesion partially filled with fluid and a large bursitis of the right gluteal region (large arrow). c On coronal T1-weighted fat-sat images after gadolinium administration, the abscess walls appear highly vascularised. The gluteal bursitis seems to be communicating with the infectious process, suggesting a septic bursitis. A prominent contrast enhancement is also seen to the sacrum, suggesting a bony involvement by the septic process. d Axial CT imaging performed with patient in a different leg positioning . The exam validates the connection between the perineal abscess and the gluteal bursitis. Amorphous calcifications (asterisks) are enclosed within the septic bursitis at the right gluteal region