발톱 밑에 발생한 기괴 방골성 골연골성 증식증 1예

Bizarre parosteal osteochondromatous proliferation (Nora’s lesion) is a rare lesion with a tendency to recur. It is usually a solitary lesion that most often develops on the hands and feet. We now present a case of bizarre parosteal osteochondromatous proliferation initially misdiagnosed as subungual exostosis on the left great toe of a 13-year-old boy. The diagnosis was confirmed by radiologic and histopathologic features, followed by complete excision of the lesion. He had a relapse after two months and was treated with re-excision. We suggest that bizarre parosteal osteochondromatous proliferation should be considered in the differential diagnosis of any digital mass. (Korean J Dermatol 2011;49(9):830∼832)