title: Pigmented nail with atypical melanocytic hyperplasia.
abstract: We report two cases showing black discoloration of the thumb nail which were histologically found to be acral lentiginous melanoma (ALM) in situ. A pigmented subungual lesion is more frequently malignant than benign and it is generally believed that diagnosis of subungual melanoma during the radial-growth phase is very difficult. Our cases are particularly interesting because atypical melanocytic hyperplasia was confined to the epidermis despite the lesion being present for a long time.
authors.affiliation: Department of Dermatology, Seoul National University College of Medicine, Korea.
authors.forename: K H
authors.initials: KH
authors.lastname: Cho
authors.forename: B S
authors.initials: BS
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Chang
authors.forename: Y S
authors.initials: YS
authors.lastname: Lee
authors.forename: K J
authors.initials: KJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000473:pathology; D008297:Male; D008545:Melanoma / Q000473:pathology*; D008875:Middle Aged; D009260:Nail Diseases / Q000473:pathology*; D013933:Thumb