Abstract

Subungual exostosis is an acquired, benign often painful and nearly always solitary bone tumor usually occuring in the dorsal medial aspect of the phalanges. The exact diagnosis is challenging because many cases are initially misdiagnosed. It’s a variant of osteochondroma. A 9 year old male patient presented with a progressively enlarging mass and pain that developed över 1 years in the medial aspect of the left first toe. Conventional radiographs and histopathologic findings shovved subungual exostosis. Complete removal of the tumor vvas performed including its base of in the cortex of the phalanx. No reccurence and malign transformation vvas observed during a follow-up of 9 months. İt vvas emphasized that clinical presentation of subungual exostosis may resembie other benign or malignant bone tumors. The exact diagnosis and surgical treatment is the most important for the subungual exostosis.