Giant cell tumour
A 35 year man presented with gradually increasing swelling in wrist from 2 years ago which became painful in last 6 months.
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Radiograph wrist AP and lateral views showing an expansile lesion giving characteristic "soap bubble appearance" involving the subarticular region of radius with cortical breech on medial aspect.
Also noted is increased overlying soft tissue shadow and osteopenic changes in carpal bones and periarticular areas.
Giant cell tumours are usually benign, but a few can be malignant, however imaging cannot differentiate between benign and malignant tumours.
GCT usually involves subarticular region distal radius and distal femur, the proximal tibila being most common site. Occasionally can involve metacarpals, mandible or pelvis.