Pain. History of sarcoma resection Again seen is a large mass situated within the posterolateral aspect of the left mid thigh. It is approximately 5 x 5.3 cm in greatest transverse dimension, and approximately 16 cm in craniocaudal dimension. The mass lies just lateral to the semitendinosus muscle and sciatic nerve. It is slightly hyperintense to skeletal muscle on T1-weighted images. It is heterogeneous on T2-weighted images with foci that are hyperintense and isointense to skeletal muscle, as well as a rim of low signal intensity. There is a slightly irregular, thin, incomplete rind of enhancement following gadolinium administration, but overall the mass does not enhance. The superior margin of the mass lies just below the inferior fibers of the gluteus maximus muscle, which show mild edema and enhancement but no discrete intramuscular mass. There is a surgical scar superficial to the mass traversing the subcutaneous fat. There is mild edema within the musculature of the thigh, particularly distally, that may reflect prior treatment. Mild edema is also noted between the peripheral deep fascia and the underlying vastus lateralis muscle. There is a small knee joint effusion with peripheral enhancement suggesting a mild synovitis. Bone marrow signal intensity of the femur is within normal limits.
Findings compatible with postoperative hematoma as described above.