Abstract
Extraskeletal chondroma comprises synovial chondromatosis, intracapsular chondroma and soft tissue chondroma, its presentation in the hand, however, is very rare. A 42-year-old woman presented with a mass around right fourth metacarpophalangeal (MCP) joint. She had no pain or discomfort in activities. The radiographs showed soft tissue swelling, but no calcification or ossifying lesions. The magnetic resonance imaging (MRI) showed a lobulated juxta-cortical encircling mass existing around the fourth MCP joint. We did not suspect any cartilage-forming tumour in MRI. The mass was easily removed because there was no adhesion with surrounding tissues and the specimen had the appearance of a cartilage. The histological diagnosis was chondroma. Based on the tumour location and histological results, we diagnosed it as intracapsular chondroma. Although intracapsular chondroma is very rare-ly seen in the hands, it is important to consider an intracapsular chondroma when differentiating a tumour in the hand because it is difficult to diagnose one in an imaging examination. Level of Evidence: Level V (Therapeutic).
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