title: Onychomatricoma: a rare case of unguioblastic fibroma of the fingernail associated with trauma.
abstract: Onychomatricoma (OM) is a rare tumor originating from the nail matrix. Fingernail involvement is twice as common as toenail involvement. Onychomatricoma is the only tumor that actively produces a nail plate. Clinically, it presents with yellow discoloration along the entire nail plate, proximal splinter hemorrhages, and a tendency toward transverse overcurvature of the nail plate with prominent longitudinal ridging. We report a rare case of OM in which the etiology was associated with trauma. Onychomycosis can be present, which may serve as a predisposing factor or be secondary to the deformed nail plate. Histologically, the tumor is fibroepithelial or biphasic with stromal and epithelial components. Onychomatricoma has been further classified into 3 types, including unguioblastoma, unguioblastic fibroma, and atypical unguioblastic fibroma. Our case represents the unguioblastic fibroma type.
authors.affiliation: Division of Dermatology, Loyola University Medical Center, Maywood, Illinois, USA.
authors.forename: Joshua
authors.initials: J
authors.lastname: Mandrell
mesh_terms: D000368:Aged; D001265:Athletic Injuries; D001484:Baseball / Q000293:injuries; D003937:Diagnosis, Differential; D005350:Fibroma / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D009262:Nails / Q000293:injuries*; D009264:Nails, Malformed / Q000209:etiology; D012878:Skin Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology