Incidental finding after trauma.
Right hand radiograph
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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.
DIAGNOSIS: Right little finger proximal phalanx biopsy: Fibrous dysplasia.