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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]
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.
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Trichilemmal carcinoma is a cutaneous condition reported to arise on sun-exposed areas, most commonly the face and ears. [1]: 674 ...
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.
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)
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