Test Yourself Question: A 36-year-old male presenting with a painful swollen right thigh for several months—no previous history of trauma

Figures 1, 2, 3 and 4

Fig. 1

AP radiograph of the right thigh

Fig. 2

a Coronal T1W TSE and b coronal and c axial STIR MR images of the right thigh

Fig. 3

Coronal CT MPR of the right thigh

Fig. 4

Histology. H&E a × 20 magnification and b × 210 magnification