Isolated Longitudinal Leukonychia

Isolated longitudinal leukonychia is an example of localized metaplasia. It is characterized by a permanent, greyish-white longitudinal streak, 1 mm wide, below the nail plate. Histologically there is a mound of horny cells causing the white discoloration due to a lack of transparency, leading to alteration in light diffraction. Subungual filamentous tumour is the most common cause. Imbibition of blood may turn distal parts brown or even black.

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