a large osteolytic lesion in the proximal end of the proximal phalanx of middle finger.
The differential diagnosis includes enchondroma, chondrosarcoma, aneurysmal bone cyst, and giant cell tumor.
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I think it is a simple enchondroma, although there is no chondroitin calcification. lack of soft tissue swelling and bone deformity without cortical rupture, eliminates chondrosarcoma.
Thanks for the case triggering discussion!
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