Bano et al. Journal of Medical Case Reports 2010, 4:236 http://www.jmedicalcasereports.com/content/4/1/236 Page 3 of 4 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. Figure 3 Intra-operative picture showing the sciatic nerve (white arrow) and the ruptured quadratus muscle (black arrow). Figure 4 Hematoxylin and eosin stain, magnification ×400 (×400, H&E). Histopathological examination of the removed mass showing a significant quantity of fibrotic tissue and atrophy of muscles bundles.