Grade IB. A 43-year-old man. A well-defined tumor is observed in the proximal femur. No penetration of cortex is evident. A faint sclerotic margin is observed in parts of the lesion (solid arrow); other parts of the lesion do not show a sclerotic margin (dashed arrow). There is no expanded shell. Because the sclerotic margin is not visible around the entire lesion, Lodwick growth grade IB is assigned. MRI was performed for further evaluation; the lesion proved to be a lipoma