title: Necrotizing Infundibular Crystalline Folliculitis: A Case Report of an Exceptional Lesion of Unknown Etiology.
abstract: Necrotizing infundibular crystalline folliculitis is a rare follicular lesion of which the etiology is not well understood. Here we describe the case of a 71-year-old male patient presenting with multiple hyperkeratotic lesions localized on the forehead. Histopathological analysis of one of the lesions revealed a follicular invagination containing cellular debris and keratin lamellae containing filamentous mucinous material and numerous crystals birefringent in polarized light microscopy.
authors.affiliation: Dermatopathology Unit, Department of Dermatology, University Hospital of Geneva, Geneva, Switzerland.
authors.forename: Nikolina
authors.initials: N
authors.lastname: Saxer-Sekulic
authors.affiliation: Laboratoire Viollier Morges SA, Dermatopathology, Lausanne, Switzerland.
authors.forename: Brigitte
authors.initials: B
authors.lastname: Vion-Gauthey
authors.affiliation: Dermatopathology Unit, Department of Dermatology, University Hospital of Geneva, Geneva, Switzerland.
authors.forename: Gürkan
authors.initials: G
authors.lastname: Kaya
keywords: Birefringent crystals; Malassezia; Mucin; Necrotizing infundibular crystalline folliculitis