Osteochondromas A subungual exostosis is a bony prominence that can occur under the toenail. They generally are a result of ... An osteochondroma is a benign bone tumor that accounts for 50% of all benign bone tumors. They have a predilection for the long ... Additionally other small tumors called osteochondromas and enchondroma can also form in the bone beneath the toenail as well as ... The treatment of symptomatic osteochondromas is surgical excision. The final diagnosis is made after the bone tumor is removed ...