- Etiology: benign bony growth covered by cartilage cap caused by piece of growth plate separates + lays down cartilage off of normal axis of development
- Imaging: cartilage-capped bone projection, location usually is metaphysis of tubular long bones or costochondral junction (metaphyseal equivalent), sessile or pedunculated cystic growth on bony stalk / excresense away from metaphysis / growth plate
- US: cartilaginous cap is hypoechoic with internal echogenicity similar to normal epiphyseal cartilage
- Complications: 1-2% degenerate into chondrosarcoma
- Clinical: presents as hard, mobile mass, pain may be due to nerve impingement, bursitis, vascular compression, most common benign bone tumor
Radiology Cases of Osteochondroma

