Abstract
The excisional removal of the entire pigmented matrix and the histologic examination of the specimen remains the gold standard in the diagnosis of longitudinal melanonychia. Compared with other nail matrix biopsy techniques, tangential biopsy of the matrix has the advantage of producing minimal scarring and postoperative dystrophy, although in some cases there's a risk for a small undulation in the nail plate that resolves as it grows out. Tangential biopsy also provides an adequate sample for histopathologic analysis of longitudinal melanonychia.
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