Enchondroma is a solitary, benign, intramedullary cartilage tumor that is usually found in the short tubular bones of the hands and feet. The peak incidence is in the third decade and is equal between men and women.
It is the most common primary tumor in the hand and is normally found in the diaphysis. The mature hyaline cartilage located centrally within short tubular bones usually presents clinically as a fracture due to an enlarging lesion. Enchondromas are also found incidentally in long bones and undergo malignant transformation in less than 1% of cases.
Enchondromas are usually long and oval and have well-defined margins. In larger lesions, the lucent defect has endosteal scalloping and the cortex is expanded and thinned. Calcifications throughout the lesion can range from punctate to rings.


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