RT Journal Article SR Electronic T1 Skin adnexal neoplasms—part 1: An approach to tumours of the pilosebaceous unit JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 129 OP 144 DO 10.1136/jcp.2006.040337 VO 60 IS 2 A1 Alsaad, K O A1 Obaidat, N A A1 Ghazarian, D YR 2007 UL http://jcp.bmj.com/content/60/2/129.abstract AB 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.