Pigmented onychomatricoma: A clinical simulator that could not mislead ultrasound.

Introduction: Onychomatricoma is a rare subungual tumor composed of stroma and nail matrix-like epithelium. Only seven cases of the pigmented variant have been reported in the literature.

Case Report: We present a 62-year-old male patient with a 2-years history of a single fingernail thickening, deformation, and hyperpigmentation.