A Rare Case of Adolescent Subungual Osteochondroma of the Hallux

A 17-year-old male presented with a painful subungual mass, which was clinically diagnosed as a subungual exostosis prior to surgical referral. Few reported cases of subungual osteochondroma exist in the literature, and those published describe skin or nail deformities resulting from the lesion. These deformities can easily be misdiagnosed as subungual exostosis by clinical examination alone. The characteristic findings in this case resulted in a diagnosis of subungual osteochondroma, which was successfully resolved following surgical excision. This report highlights the clinical, radiographic, and histopathologic characteristics of subungual osteochondroma, and differentiates it from subungual exostosis. The results report on the success of a 2-year post-surgical audit of patient-related outcomes.