SNOMED CT, US Edition

Last uploaded: March 22, 2026
Id http://purl.bioontology.org/ontology/SNOMEDCT/773641008
http://purl.bioontology.org/ontology/SNOMEDCT/773641008
Preferred Name

Onychocytic matricoma

Definitions
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 endokeratinization in the deep portion and concentrically arranged nests of prekeratogenous and keratogenous cells. 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 endokeratinisation in the deep portion and concentrically arranged nests of prekeratogenous and keratogenous cells. 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. 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.
Synonyms
Acanthoma of nail matrix
Onychocytic matricoma (disorder)
Type http://www.w3.org/2002/07/owl#Class
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