Melanonychia following mohs surgery for recurrent squamous cell carcinoma in situ of the nail bed.
BACKGROUND
Longitudinal melanonychia (LM) is characterized by the appearance of a longitudinal pigmented band in the nail plate. Melanonychia can occur from many causes, including racial predisposition, trauma, drugs, pregnancy, Addison disease, Peutz-Jeghers syndrome, Laugier-Hunziker syndrome, Bowen disease, onychomycosis, benign nail matrix nevi, and melanoma.


OBJECTIVE
We present a case of diffuse melanonychia developing several months following Mohs surgery for a human papillomavirus-induced recurrent squamous cell carcinoma in situ of the nail bed.


CONCLUSIONS
This case illustrates the diagnostic dilemma in determining the etiology of the melanonychia and considers the differential diagnosis.
Lipoff
Jules B
JB
Dermatology Service and Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
Scope
Alon
A
Busam
Klaus J
KJ
Nehal
Kishwer S
KS
D000328:Adult; D001706:Biopsy; D002294:Carcinoma, Squamous Cell / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008548:Melanosis / Q000473:pathology* / Q000601:surgery*; D015580:Mohs Surgery; D009260:Nail Diseases / Q000473:pathology / Q000601:surgery*; D009364:Neoplasm Recurrence, Local