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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 ...
Proliferating trichilemmal cysts (also known as a pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, and proliferating trichilemmal tumor) [1] is a cutaneous condition, characterized by proliferations of squamous cells forming scroll-like structures.
A sebaceous cyst is a term commonly used to refer to either: [1] Epidermoid cysts (also termed epidermal cysts, infundibular cyst) Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts) Both of the above types of cysts contain keratin, not sebum, and neither originates from sebaceous glands.
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.
Proliferating epidermoid cyst (proliferating epithelial cyst) Proliferating trichilemmal cyst (pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, proliferating trichilemmal tumor) Pseudocyst of the auricle (auricular endochondrial pseudocyst, cystic chondromalacia, endochondral pseudocyst, intracartilaginous cyst)
English: Histopathology of a trichilemmal cyst, from internal (top) to external (bottom): - Solid eosinophilic-staining keratin. - Swollen pale keratinocytes, which increase in height closer to the interior. - Small, cuboidal, dark-staining basal epithelial cells in a palisade arrangement, with no distinct intercellular bridging. - Fibrous capsule.
Proliferating epidermoid cyst; Proliferating epithelial cyst; Proliferating follicular cystic neoplasm; Proliferating pilar tumor; Proliferating trichilemmal cyst; Proliferating trichilemmal tumor; Pseudocyst of the auricle; Pseudoepitheliomatous keratotic and micaceous balanitis; Pseudoglandular squamous cell carcinoma; PUVA keratosis
The epidermoid cyst may have no symptoms, or it may be painful when touched. It can release macerated keratin. In contrast to pilar cysts, epidermoid cysts are usually present on parts of the body with relatively little hair. [2] Some vaginal cysts are epidermoid cysts. [3]