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skINsight
September 2007

Subungual Exostosis

Author Affiliations
 

JAMES M.GRICHNIKMD, PhD

Arch Dermatol. 2007;143(9):1234. doi:10.1001/archderm.143.9.1234

Subungual exostosis is an outgrowth of normal bone or calcified cartilaginous remains characterized by the triad of pain, nail dystrophy, and characteristic radiographic features.

Case 1 involves a 13-year-old boy who presented with a 12-month history of an enlarging and painful lesion localized on the dorsum of the right great toe that appeared after a trauma. Physical examination revealed the presence of a flesh-colored, well-circumscribed elevation that measured 2.0 × 1.5 cm that caused onycholysis of the affected nail (Figure 1A).

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