Fig. 7
From: Pelvic heterotopic ossification: when CT comes to the aid of MR imaging
The same patient as in Fig. 6: the corresponding MR examination (a, b) performed on the same day as CT examination shown in Fig. 6b. Muscle swelling and heterogeneity (large arrow) is clearly noticeable on STIR images (a) and T2-weighted images (b) associated with inflammatory changes of contiguous retroperitoneum tissue (asterisks). A marked intra-articular fluid collection is also evident to the right of the coxofemural joint (small arrows). T1-enhanced (d) compared with T1-weighted unenhanced images (c): after i.v. gadolinium administration, a heterogeneous and prominent contrast-enhancement is evident inside the right ileopsoas muscle encircling a “dark spot” corresponding to the ossification