Figure 1.

A 29 year old male with myositis ossificans of the quadratus lumborum muscle. Protocol: Non-contrast enhanced CT, Siemens Somatom. Images were acquired kVp 120, mAs 51, helical acquisition, pitch 0.8, the original image collimation was 1.2 mm, the final images were reformatted to 5 mm thickness.

a) An axial CT scan in the mid-portion of the abnormality reveals a thick cortical type of bone and a central lucency within the region of ossification (arrow).

b) An axial CT scan in the caudal aspect of the ossification near the junction with the left iliac bone again reveals dense cortical type bone with more lucent bone centrally (arrow).