Pediatric Osteochondroma

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

Radiology Cases of Osteochondroma

Radiograph of multiple osteochondromas of the knee — AP radiograph of the knees shows bilateral lesions arising from the medial aspect of each tibial metaphysis, with a bony stalk growing away from the metaphysis with a lytic lesion growing at the tip of each stalk with a narrow zone of transition and no associated periosteal reaction.

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.