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A fairly well defined soft tissue mass lesion measuring approx 14.5 x 5.9 cms is seen involving the muscles of the posterior compartment of left leg (gastrocnemius, soleus and tibialis posterior). The lesion displays hypointense signal on T1 with a few areas of T1 hyperintensity, with low signal on GRE and heterogeneous signal on T2/STIR images . The lesion demonstrates heterogeneously intense post contrast enhancement. Perilesional edema is seen extending around the neurovascular bundle causing partial encasement of the posterior tibial artery at the mid calf level.
Underlying bones (tibia and fibula) appear normal with no sign of involvement by the mass. The overlying skin is unremarkable.