Pigmented nail with atypical melanocytic hyperplasia.
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.
Cho
K H
KH
Department of Dermatology, Seoul National University College of Medicine, Korea.
Kim
B S
BS
Chang
S H
SH
Lee
Y S
YS
Kim
K J
KJ
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