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Chapter-12 Pilosebaceous Disorders and Cysts

BOOK TITLE: IADVL Color Atlas of Dermatopathology

Author
1. Nischal KC
2. Khandpur Sujay
3. Mysore Venkataram
4. Mahajan Pradeep
5. Gopinath Nandakumar
ISBN
9789385891236
DOI
10.5005/jp/books/12981_13
Edition
1/e
Publishing Year
2017
Pages
18
Author Affiliations
1. Adichunchanagiri Institute of Medical Sciences, Bellur, Karnataka, India, Adichunchanagiri Institute of Medical Sciences, Bengaluru, Karnataka, India, Nirmal Skin and Hair Clinic; Kaya Skin Clinic, Bengaluru, Karnataka, India, Nirmal Skin and Hair Clinic, Bengaluru, Karnataka, India
2. All India Institute of Medical Sciences, New Delhi, India, All India Institute Medical Science, New Delhi
3. Venkat Charmalaya-centre for Advanced, Dermatology and Postgraduate Training City, Bengaluru, Karnataka, India, Venkat Center for Skin and Plastic Surgery, Bengaluru, Karnataka, India, (Accredited to Rajeev Gandhi University of Health Sciences, Bengaluru), Bengaluru, Karnataka, India
4. Dr Mahajan’s Dermatology and Dermatopathology Services, Pune, Maharashtra, India
5. Government Medical College, Thiruvananthapuram, Kerala, India
Chapter keywords
Alopecia areata, androgenetic alopecia, telogen effluvium, trichotillomania, pseudopelade, folliculitis decalvans, epidermal cyst, trichilemmal cyst, steatocystoma multiplex, vellus hair cyst

Abstract

This chapter focuses on pilosebaceous disorders and cysts including images of nonscarring alopecia, scarring alopecias, cysts and acne vulgaris. In telogen effluvium, examination of plucked hairs will reveal telogen counts greater than 25%. In lichen planopilaris lymphocytes extend up to the stem cells whereas, in alopecia areata, lymphocytes infiltrate bulge region of the follicle. Immunofluorescence in alopecia areata shows deposits of C3 and occasionally of IgG and IgM along the basement zone of the inferior segment of hair follicles. In androgenetic alopecia, the connective tissue contains small elastin bodies (Arão–Perkins bodies) which indicate the sites of the papillae of each preceding generation of follicles. They stain with the acid orcein method, but not Verhoeff. Alopecia areata does not show these bodies.

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