title: Skin adnexal neoplasms--part 1: an approach to tumours of the pilosebaceous unit.
abstract: Skin adnexal neoplasms comprise a wide spectrum of benign and malignant tumours that exhibit morphological differentiation towards one or more types of adnexal structures found in normal skin. Most adnexal neoplasms are relatively uncommonly encountered in routine practice, and pathologists can recognise a limited number of frequently encountered tumours. In this review, the first of two, the normal histology of the skin adnexal structures is reviewed, and the histological features of selected but important benign and malignant tumours and tumour-like lesions of pilosebaceous origin discussed, with emphasis on the diagnostic approach and pitfalls in histological diagnosis.
authors.affiliation: Department of Laboratory Medicine and Pathobiology, University of Toronto and University Health Network, Toronto, Ontario, Canada.
authors.forename: K O
authors.initials: KO
authors.lastname: Alsaad
authors.forename: N A
authors.initials: NA
authors.lastname: Obaidat
authors.forename: D
authors.initials: D
authors.lastname: Ghazarian
mesh_terms: D006801:Humans; D018294:Neoplasms, Adnexal and Skin Appendage / Q000473:pathology*; D018295:Neoplasms, Basal Cell / Q000473:pathology; D012626:Sebaceous Gland Neoplasms / Q000473:pathology; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology*