title: Pigmented Onychomatricoma: A Rare Pigmented Nail Unit Tumor Presenting as Longitudinal Melanonychia That Has Potential for Misdiagnosis as Melanoma.
abstract: Pigmented onychomatricoma is a rare nail unit tumor that can clinically mimic nail unit melanoma. We report the case of a 63-year-old male with new-onset longitudinal melanonychia involving his right second toe. An excisional biopsy was performed and demonstrated pigmented onychomatricoma. We present this case to alert clinicians of this rare nail unit tumor and the importance of clinicopathologic correlation to avoid misdiagnosis.
authors: Fellow, Foot and Ankle Deformity Correction, International Center for Limb Lengthening, Rubin Institute for Advanced Orthopedics, Sinai Hospital, Baltimore, MD. Electronic address: jwynes@gmail.com.
authors: Jacob
authors: J
authors: Wynes
authors: Assistant Professor, Department of Dermatology, University of Iowa, Iowa City, IA.
authors: Karolyn A
authors: KA
authors: Wanat
authors: Second Year Resident, Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA.
authors: Auris
authors: A
authors: Huen
authors: Director of Residency, Division of Podiatric Surgery, Penn Presbyterian Medical Center, Philadelphia, PA.
authors: Alan J
authors: AJ
authors: Mlodzienski
authors: Assistant Professor, Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA.
authors: Adam I
authors: AI
authors: Rubin
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis; D008875:Middle Aged; D009262:Nails / Q000473:pathology*; D035583:Rare Diseases; D012878:Skin Neoplasms / Q000473:pathology*
keywords: biopsy; melanoma; nail; onychomatricoma; tumor