Figure 2

The follow-up MRI examination was performed six months later. (a) The transverse fat suppressed proton density (PD)-weighted TSE image, shows persistent dimensions of the hematoma-like lesion in the quadratus femoris (arrow) and the obturator internus (open arrow) muscles. The corresponding T1-weighted spin echo (SE) images show the high signal intensity on the bone-tendinous junction of the quadratus femoris (arrows in b) and obturator internus (arrow in c). These areas histologically turned out to correspond to a mixture of chronic hematoma, fibrosis, granulation tissue and fatty infiltration.