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Benign tumours, moles, birthmarks and cysts
Published in Ronald Marks, Richard Motley, Common Skin Diseases, 2019
The lining epithelium of these cysts which are commonly seen on the scalp is derived from a portion of the hair follicle neck and shows a quite characteristic type of keratinization in which there is abrupt formation of a glassy-appearing type of horn without a granular cell layer. Pilar cysts are usually multiple and are often genetically determined as an autosomal dominant trait. They occur on the scalp and on the scrotum in particular.
Benign and Malignant Conditions of the Skin
Published in John C Watkinson, Raymond W Clarke, Terry M Jones, Vinidh Paleri, Nicholas White, Tim Woolford, Head & Neck Surgery Plastic Surgery, 2018
Murtaza Khan, Agustin Martin-Clavijo
A number of benign cysts can arise on the head and neck. Dermoid cysts are developmental inclusion cysts that appear at birth or in childhood and are commonly seen on the face. They contain mature skin with hair follicles, sweat glands and sebaceous glands. Epidermoid cysts form from proliferation of squamous epithelium in the dermis, which can follow trauma or a blocked pore. They are commonly seen on the face, neck and scalp. Pilar or trichilemmal cysts arise from stratified squamous epithelium similar to that found in hair follicles. Most pilar cysts occur on the scalp but may also form on the face or neck. Cysts may cause problems with cosmesis or symptoms following inflammation, and surgical excision can be offered for these reasons.
Cutaneous Cysts
Published in Omar P. Sangueza, Sara Moradi Tuchayi, Parisa Mansoori, Saleha A. Aldawsari, Amir Al-Dabagh, Amany A. Fathaddin, Steven R. Feldman, Dermatopathology Primer of Cutaneous Tumors, 2015
Pilar cyst: Lack of granular layerCompact and homogenous contents (loose and flaky in epidermal cysts)Calcification may be present
Poroid hidradenoma of the scalp in a US Veteran’s Administration (VA) patient
Published in Case Reports in Plastic Surgery and Hand Surgery, 2021
M. Mukit, M. Mitchell, I. Ortanca, N. Krassilnik, X. Jing
A fifty-eight-year-old male with a history of hypertension, anxiety, depression, and chronic low back pain presented with a one-year history of a right parietal scalp mass. He believed that the mass first appeared after he bumped his head, but he was not sure. The patient denied any drainage, pain, numbness, tingling, fever, or redness. Medications included acetaminophen, bacitracin, ranitidine, ketotifen fumarate, ammonium lactate, castellani colorless topical paint, urea 20% cream, celecoxib, and cyclobenzaprine. The patient denied any smoking, alcohol, or drug use. Family history was non-contributory, and he had no known drug allergies. On physical exam, he was found to have a mobile and cystic appearing right parietal scalp mass with a punctum. The differential diagnosis included an epidermal inclusion cyst, pilar cyst, or lipoma.
Malignant proliferating trichilemmal tumor of the scalp: report of 4 cases and a short review of the literature
Published in Case Reports in Plastic Surgery and Hand Surgery, 2022
Cemal Alper Kemaloğlu, Melikgazi Öztürk, Beyza Aydın, Özlem Canöz, Orhun Eğilmez
On the other hand, MPTT is a less often adnexial cancer originating from the outer sheath epithelium of hair follicles. MPTTs constitute less than 0.1% of skin cancers [10]. Although it usually develops over existing pilar cysts, they can also occur as a denovo without a precursor lesion [11]. They are generally seen on the sun-exposed areas and especially on the scalp in elderly women. Since it originates only from the terminal hair root, it is very unlikely to develop from lanugo in bald men or from nonterminal hair follicles on the body [12].