Fig. 1
From: Pelvic heterotopic ossification: when CT comes to the aid of MR imaging
A 58-year-old paraplegic man, post trauma. a On axial STIR a diffuse increased signal intensity involving the right obturator externus-adductor muscles suggests an inflammatory reaction as observed in the early phase of ossification. b On CT axial scan a circumscribed amorphous calcification showing ill-defined margins and no trabecular structure is evident within the periphery of the adductor brevis muscle belly