Generalized muscle weakness There is mild edema signal within the abductor musculature of the thigh bilaterally, right slightly greater than left. There is also mild edema type signal within the anterior compartment of the distal femur. There is mild diffuse fatty atrophy of the pelvic and lower extremity musculature.Scattered foci of increased marrow signal are noted within the proximal femora bilaterally, particularly on the right. These may represent areas of early bone infarction. Additional areas of osteonecrosis are seen within the right distal femur and proximal tibia. There is a moderate-sized joint effusion of the knee.
1. Mild edema within the abductor muscles and anterior compartment of the distal femur compatible with mild myositis. There is also mild diffuse fatty atrophy of the pelvic and lower extremity musculature.2. Osteonecrosis of the distal femur and proximal tibia with scattered areas of abnormal marrow signal within the proximal femora which may reflect early bone infarction.