- Developmental anomaly
- Physeal cartilage displaced to metaphyseal region
- Knee most common site
- Osteochondromas have a cartilaginous cap
- Pedunculated or sessile
- Solitary or multiple
- Seen in multiple hereditary exostoses
- Local pressure on adjacent structures
- Growth after skeletal maturity and persistent pain suggest malignant change
- Plain film
- Bone lesion with medullary continuity arising from metaphysis quite often pointing away from the physis
- Shows thickness of cartilaginous cap
- Cap thickness up to 3 cm in children and adolescents
Murphey, Mark D., et al. “Imaging of osteochondroma: variants and complications with radiologic-pathologic correlation.” Radiographics 20.5 (2000): 1407-1434.
Shah, Jignesh N., et al. “Pediatric benign bone tumors: what does the radiologist need to know?: pediatric imaging.” RadioGraphics 37.3 (2017): 1001-1002.