Subungual exostosis


Subungual exostoses are benign osteocartilaginous tumors. They mostly affect the big toe and are predominantly found in children and young adolescents. They probably result from metaplasia in mechanical irritations or diseases of the nailbed. The precise etiology is unknown1.

The lesion seems to be distinct from osteochondroma2 and also has to be differentiated from a Nora's lesion (BPOP) and aggressive lesions.