Extensive infiltrative mass involving subcutaneous tissue from lower back and left lateral abdominal wall to the proximal left thigh and along the left sciatic nerve. There is also involvement of the extraperitoneal pelvis, with local muscle and left iliac bone involvement. The mass has low T1 signal and focal areas of fat tissue and contrast enhancement delineating with collections (necrotic tissue).
The mass has also extensively infiltrates the subcutaneous tissues through the deep fat planes along all lower left limb.