The imaging features are those of a low aggressive lesion, and differentials would include enchondroma and fibrous dysplasia.
The lesion was biopsied: Sections show three pieces of tissue comprised of immature woven bone with broad osteoid seams around central calcified areas, surrounded by fibrous tissue with a few osteoclasts and scattered small vessels. There is no inflammation or atypia. No cartilage is present. There is no evidence of malignancy.