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A rare benign nail tumor originating in the nail matrix characterized by localized pachyonychia and variable degrees of pigmentation: pigmented, melanocytic (common, longitudinal melanonychia that may simulate a foreign body) or hypopigmented. Histopathology demonstrates a purely epithelial tumor with endo-keratinization in the deep portion and concentrically arranged nests of pre-keratogenous and keratogenous cells.
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A rare benign nail tumour originating in the nail matrix characterised by localised pachyonychia and variable degrees of pigmentation: pigmented, melanocytic (common, longitudinal melanonychia that may simulate a foreign body) or hypopigmented. Histopathology demonstrates a purely epithelial tumour with endo-keratinisation in the deep portion and concentrically arranged nests of pre-keratogenous and keratogenous cells.
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