- 2nd-4th decade
- Intramedullary neoplasm
- Lobules of benign hyaline cartilage
- Second most common benign chondral lesion after osteochondroma
- Tubular bones of hands and feet
- Asymptomatic, present when size increases or when pathological fracture occurs
- Proximal phalanges in most cases, then metacarpals, middle phalanges
- Less common in bones of feet, femur, tibia and humerus
- Enchondroma protuberans – eccentric enchondroma with extra-osseous component, covered by thin shell of intact cortical bone. Fingers or toes.
- Centrally in phalanges and metacarpals
- Metaphyseal or diaphyseal
- Eccentric and often solitary
- Well circumscribed, lobular or oval lytic lesions
- May expand the cortex
- 10 to 50 mm in size
- Chondral-type mineralization may be seen
- MRI – small septa within lesion shows mild enhancement.
Melamud, Kira, et al. “Diagnostic imaging of benign and malignant osseous tumors of the fingers.” Radiographics 34.7 (2014): 1954-1967.
Murphey, Mark D., et al. “Enchondroma versus chondrosarcoma in the appendicular skeleton: differentiating features.” Radiographics 18.5 (1998): 1213-1237.