Subungual exostosis

Discussion:

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. Their precise etiology is unknown 1.

The lesion seems to be distinct from osteochondroma 2 and also has to be differentiated from Nora lesion (BPOP) and aggressive lesions.

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