An exostosis (plural: exostoses) is the formation of new bone on the surface of a bone.
When used in the phrases "Cartilaginous exostosis" or "Osteocartilaginous exostosis", it is considered synonymous with Osteochondroma. (Some sources consider the terms to mean the same thing even without qualifiers, but this interpretation is not universal.)
- Multiple hereditary exostosis (MHE)
- Subungal exostosis
- Buccal exostosis