Biopsy proven case.
Chondromas are benign tumors composed of mature hyaline cartilage, these tumors are named according to their location such as:
enchondroma: when they occur in the medullary canal of the bone
periosteal or juxta-cortical chondroma: when they occur on the surface of the bone
soft-tissue or synovial chondroma: when they arise from the synovial sheaths of tendons or in the soft tissue sheaths