Subungual Posttraumatic Ectopic Nail.

Ectopic nail is defined as the malformation of nail tissue in a location other than the usual nail unit. We present a 12-year-old boy with a single dystrophic thumb nail after an injury. The nail was observed under the original nail and it is linked to the original nail plate by longitudinal bridge formation with parallel growth. According to these clinical findings, the diagnosis of subungual posttraumatic ectopic nail was made.