It is characterized by the growth of cartilage-capped benign bone tumours around areas of active bone growth, particularly the metaphysis of the long bones. Typically five or six<unk>  are found in upper and lower limbs. Most common locations are: * Distal femur (70%) * Proximal tibia (70%) * Humerus (50%) * Proximal fibula (30%)<unk>  can lead to the shortening and bowing of bones; affected individuals often have a short stature. Depending on their location the<unk>  can cause the following problems: pain or numbness from nerve compression, vascular compromise, inequality of limb length, irritation of tendon and muscle, Madelung's deformity as well as a limited range of motion at the joints upon which they encroach. A person with<unk>  has an increased risk of developing a rare form of bone cancer called chondrosarcoma as an adult. Problems may be had in later life and these could include weak bones and nerve damage. The reported rate of transformation ranges from as low as 0.57% to as high as 8.3% of people with<unk> . Some authors have described an association between<unk>  and the presence of popliteal pseudoaneurysms
Hereditary multiple exostoses
Inherited patterned lentiginosis
Diffuse idiopathic skeletal hyperostosis
Pycnodysostosis
Familial myxovascular fibromas
Nevoid basal-cell carcinoma syndrome
Gerodermia osteodysplastica
Acrofrontofacionasal dysostosis