Fig. (5) (a) Axial T1-weighted spin echo and (b) axial T2- weighted TSE fat suppressed MR images demonstrate the large symptomatic osteochondroma arising from the posteromedial aspect of the left proximal femur (short arrow) which displaces the left gluteus maximus muscle. Also seen is a small osteochondroma causing a pressure erosion on the posterior surface of the left pubic body (long arrow). No bone marrow edema is associated with the left pubic body erosion.