title: Hair follicle nevus of the abdominal skin: an unusual extracephalic presentation.
abstract: Hair follicle nevus (HFN) is a rare hamartoma typically diagnosed on the face of infants, where it may clinically mimic an accessory tragus. We report a 6-month-old boy who presented with a congenital fleshy, bilobed papule in the midline of his upper abdomen that upon excision was classified as an HFN based on detailed histopathologic examination. Our report documents a previously undescribed extracephalic location of the HFN and therefore expands the spectrum of clinical presentations of this rare hamartoma.
authors.affiliation: Department of Dermatology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Jedrych
authors.forename: Oleg
authors.initials: O
authors.lastname: Akilov
authors.forename: Robin
authors.initials: R
authors.lastname: Gehris
authors.forename: Jonhan
authors.initials: J
authors.lastname: Ho
mesh_terms: D000005:Abdomen; D001706:Biopsy; D003937:Diagnosis, Differential; D006201:Hair Diseases / Q000473:pathology*; D018859:Hair Follicle / Q000473:pathology*; D006222:Hamartoma / Q000473:pathology*; D006801:Humans; D007223:Infant; D008297:Male; D009506:Nevus / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*