Bilateral muscle weakness Left: There is mild diffuse edema of the thigh musculature, particularly affecting the anterior and lateral compartments. Following contrast administration, there is enhancement of the muscles of the thigh most notably the rectus femoris and vastus lateralis. There is mild diffuse subcutaneous edema evident as well. The muscle caliber is consistent with the patient's age. The bone marrow signal of the femur is normal and there is no focal fluid collection.Right: There is mild diffuse edema of the thigh musculature, particularly affecting the anterior and lateral compartments. Following contrast administration, there is enhancement of the muscles of the thigh most notably the rectus femoris and vastus lateralis. There is mild diffuse subcutaneous edema evident as well. The muscle caliber is consistent with the patient's age. The bone marrow signal of the femur is normal and there is no focal fluid collection.
Symmetric edema and enhancement of the thigh musculature consistent with active myositis.