45-year-old woman. Evaluate for myositis. Right femur:There is serpentine geographic signal abnormality within the distal femoral diaphysis and femoral metaphysis, with internal fatty signal, findings representing bone infarct. Otherwise, bone marrow signal intensity of the femur is within normal limits. There is nonspecific diffuse muscle atrophy. There is no evidence of myositis or osteomyelitis.Left femur:Bony marrow signal intensity of the femur is within normal limits. There is nonspecific diffuse muscle atrophy. There is no evidence of myositis or osteomyelitis.
1. Bone infarct of the distal right femur.2. No evidence of myositis or osteomyelitis.