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| Fig. 68.9 Subungual exostosis. (Courtesy of James E.
Fitzpatrick, MD.) |
An exostosis is a common benign bony growth that
occurs on the distal phalanx, usually of the great toe.
It involves the bone first and secondarily the nail.
Trauma is thought to play a role in its development,
and it most commonly affects adolescent women.
It presents as a slow-growing painful mass under
the nail with frequent secondary infection (Fig. 68-9).
Plain x-rays will easily delineate the pathology.
