Multicentric reticulohistiocytosis, by involving the distal interphalangeal synovium or the nail matrix, may produce atrophy, longitudinal ridging, brittleness, and hyperpigmentation of the nails.
Barrow MV. The Nails in Multicentric Reticulohistiocytosis: (Lipoid Dermato-arthritis). Arch Dermatol. 1967;95(2):200–201. doi:10.1001/archderm.1967.01600320056009
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