• Etiology: piece of growth plate separates + lays down cartilage off of normal axis of development
  • Imaging: arise from metaphysis of tubular long bones, cystic growth on bony stalk / excresense away from metaphysis / growth plate, can also be sessile
  • Complications: 1-2% degenerate into chondrosarcoma

Cases of Osteochonroma

CXR and CT of osteochondroma of the rib
CXR PA shows a calcific density in the head of the left third rib. Contiguous images from an axial CT without contrast of the chest shows a bony outgrowth at the proximal aspect of the left third rib posteriorly.