12-year-old with history of knee pain and multiple exostoses MENISCI: The medial and lateral menisci are normal.ARTICULAR CARTILAGE AND BONE: Innumerable broad-based osteochondromas are noted arising from the femur, tibia, and fibula. Cartilage caps are noted, none of which measure over 1 cm in thickness. The largest osteochondroma arising from the posterior femoral metaphysis measures 41 x 11 mm (series 5, image 12). The largest osteochondroma arising from the posterior tibial metaphysis measures 21 x 10 mm (series 5, image 13).Bone marrow signal is normal.LIGAMENTS: The ACL, PCL, MCL, and LCL complex are intact. The popliteus muscle and tendon are intact.EXTENSOR MECHANISM: The patellar tendon and extensor mechanism are intact.ADDITIONAL
Innumerable osteochondromas arising from the femur, tibia, and fibula.