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Subungual exostosis - Nail and Distal Digit
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Subungual exostosis - Nail and Distal Digit

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Contributors: Shari Lipner MD, PhD, Bertrand Richert MD, Robert Baran MD, Susan Burgin MD
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Synopsis

Subungual exostosis : Exostoses, Fingernails, Nail pain, Onycholysis - lifting nail, Solitary nail or digit, Toenails
Subungual exostosis is not a true tumor but a proliferation of normal bone or calcified cartilaginous remains arising in the distal phalanx. Subungual exostosis is equally common in both sexes and usually presents as a solitary lesion at a median age of 26. It most commonly affects the great toenail (80% of cases), but involvement of other toenails or, less commonly, the fingernails may occur. The right great toenail is more commonly affected than the left great toenail, presumably due to trauma. The proliferation usually elevates the nail plate, mostly at the distolateral edge, sometimes mimicking a subungual wart. The nail plate may be progressively destroyed. Half of cases are painless, but if the exostosis is large enough, tenderness may be a feature.

Codes

ICD10CM:
D16.9 – Benign neoplasm of bone and articular cartilage, unspecified

SNOMEDCT:
26904005 – Subungual exostosis

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Last Reviewed:02/04/2019
Last Updated:02/21/2019
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Subungual exostosis - Nail and Distal Digit
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A medical illustration showing key findings of Subungual exostosis : Exostoses, Fingernails, Nail pain, Onycholysis - lifting nail, Solitary nail or digit, Toenails
Clinical image of Subungual exostosis - imageId=2704448. Click to open in gallery. caption: 'A pink papule on the nailbed with resultant paronychia.'
A pink papule on the nailbed with resultant paronychia.

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