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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]
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 ...
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.
Pilomatricoma is a benign skin tumor derived from the hair matrix. [ 2 ] [ 3 ] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities. Clinically, pilomatricomas present as a subcutaneous nodule or cyst with unremarkable overlying epidermis that can range in size from 0.5 to 3.0 cm, but the largest ...
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.
There are four types of ovarian cysts — functional cysts, PCOS cysts, benign ovarian tumor and malignant ovarian tumor — that range from harmless to fatal.
Trichilemmal carcinoma is a cutaneous condition reported to arise on sun-exposed areas, ... A similar tumor, although in the nail bed, is called onycholemmal. [2] [3]