Multiple hereditary exostoses

Multiple hereditary exostoses. This syndrome is also known as multiple osteochondromatosis, and diaphyseal aclasis. It results in multiple outgrowths of bone (osteochondromas) as well as modeling deformities of the long bones. There is a small risk of malignant degeneration of these osteochondromas to chondrosarcoma, so anyone with this condition who presents with increasing size or pain related to one of their osteochondromas should have an MRI to assess for this possibility.