A 39 year old male presented with complaints of ongoing pain and restricted movements of right knee joint for a period of 7 years. Plain radiographs showed a calcified mass in the popliteal fossa. Open excision and biopsy was performed, and microscopic examination revealed features of extraosseous osteochondroma. Integrated clinical-pathologic diagnosis protocols are helpful in ascertaining the nature of extraskeletal cartilaginous tumours that arise at unusual anatomic sites. Complete local surgical excision is the management of choice.
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