Male 68 years old Reason: evaluate for thigh myositis for biopsy. History: proximal muscle weakness, concern for polymyositis or dermatomyositis. RIGHT FEMUR:Musculature: There is widespread edema-type signal of the musculature of the right thigh as seen on fat saturation T2 weighted images with most pronounced involvement of the vastus intermedius and adductor magnus muscles. There is relative sparing of the semitendinosus muscle and gracilis. The vastus medialis, lateralis and rectus femoris distally are also relatively spared. There is also moderate fatty atrophy of the semimembranosus muscle.Bone marrow: The marrow signal intensity of the femur is within normal limits. Additional findings: Small knee joint effusion. Small bilateral hydroceles.LEFT FEMUR:Musculature: There is widespread edema-type signal of the musculature of the left thigh as seen on fat saturation T2 weighted images with most pronounced involvement of the rectus femoris proximally and adductor magnus. There is relative sparing of the vastus lateralis and intermedius as well as the distal vastus medialis and rectus femoris. There is moderate fatty atrophy of the semimembranosus as well as moderate fatty atrophy of the mid rectus femoris.Bone marrow: The marrow signal intensity of the femur is within normal limits.Additional findings: Small knee joint effusion. Small bilateral hydroceles.
Findings consistent with polymyositis as described above.