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Chondroma
1. Enchondromas -- from medullary cavity
1-1. short tubular bones of the hands and feet --> pathologic fracture
1-2. plain film: "C or O ring" sign
1-3. pathology: small nodules < 3cm, benign hyline cartilage, enchondral ossification, central calfication (dead cells)
2. subperiosteal or juxtacortical chondromas -- from surface of bone
3. Ollier disease -- multiple enchondromas or enchondromatosis
4. Maffucci syndrome -- enchondromatosis, with soft-tissue hemangiomas