Giant cell tumor of bone
Pain and swelling of the right wrist and distal forearm.
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There is a subarticular lytic expansile lesion of the distal ulna in epiphysis and metaphysis with internal septations giving a 'bubbly' appearance. There is a periosteal reaction at the junctional zone suggesting the aggressive nature of the lesion.
The subarticular location of this expansile lesion in a patient with a fused skeleton is most in keeping with a giant cell tumor.