title: [Trichilemmal horn: a new case and review of the literature].
abstract: Trichilemmal horn, or trichilemmal keratosis, is an uncommon benign neoplasm of follicular lineage with trichilemmal differentiation. The essential characteristics of this tumor are its clinical presentation in the form of a cutaneous horn with trichilemmal keratinization apparent in the histology study (with a hyperplastic epithelium giving rise to dense, orthokeratotic eosinophilic keratin). We present a new case of this type of tumor in an 82-year-old woman who developed a solitary lesion on her scalp after surgical removal of a trichilemmal cyst. On the basis of the pathology report, the tumor was diagnosed as trichilemmal horn. We review the 33 reports of this tumor in the literature to date.
authors.affiliation: Servicio de Dermatología, Fundación Jiménez Díaz, Madrid, España. rosharam@yahoo.es
authors.forename: R
authors.initials: R
authors.lastname: Haro
authors.forename: E
authors.initials: E
authors.lastname: González-Guerra
authors.forename: M C
authors.initials: MC
authors.lastname: Fariña
authors.forename: L
authors.initials: L
authors.lastname: Martín-Moreno
authors.forename: L
authors.initials: L
authors.lastname: Requena
mesh_terms: D000369:Aged, 80 and over; D004814:Epidermal Cyst / Q000150:complications*; D005260:Female; D006801:Humans; D007633:Keratins / Q000032:analysis; D007642:Keratosis / Q000175:diagnosis* / Q000473:pathology; D011183:Postoperative Complications / Q000175:diagnosis / Q000473:pathology; D012536:Scalp Dermatoses / Q000175:diagnosis* / Q000473:pathology
chemical_list: D007633:Keratins