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A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns. Trichilemmal cysts are clinically and histologically distinct from trichilemmal horns, hard tissue that is much rarer and not ...
The tumors, which are typically found in regions like the scalp with a high density of hair follicles, can be solid or solid cystic. Proliferating trichilemmal cyst frequently manifests clinically as a subcutaneous nodule that gradually grows into a big nodular mass. Rapid growth in some cases may be a sign of malignant development into cancer. [3]
Malignant trichilemmal cyst; Mantleoma; Marjolin's ulcer; Melanoacanthoma (pigmented seborrheic keratosis) Merkel cell carcinoma (cutaneous apudoma, primary neuroendocrine carcinoma of the skin, primary small cell carcinoma of the skin, trabecular carcinoma of the skin) Microcystic adnexal carcinoma (sclerosing sweat duct carcinoma)
Cock's peculiar tumour is a sebaceous cyst linked growth that can resemble a squamous cell carcinoma. [1] The name is given after a 19th-century English surgeon Edward Cock. [2] The proliferating cyst is usually solitary, but it often arises from a simple trichilemmal cysts in the hair follicle epithelium and these are multiple in 70% of cases ...
Malignant (cancerous) These tumours are cancerous and often grow rapidly, spreading quickly to other parts of the body through the bloodstream or lymphatic system, in a process called metastasis.
Very rarely it can in fact develop malignant change with development of a squamous cell carcinoma. It is commonest in the scalp, especially of the elderly, women more often than men. The proliferating pilar cyst/tumor is usually solitary, but it often arises from a simple pilar cyst and these are multiple in 70% of cases.
Pages in category "Epidermal nevi, neoplasms, and cysts" The following 200 pages are in this category, out of approximately 259 total. This list may not reflect recent changes .
Trichilemmoma (also known as "tricholemmoma" [1]) is a benign cutaneous neoplasm that shows differentiation toward cells of the outer root sheath. [2]: 673 [3] The lesion is often seen in the face and neck region.