trichilemmal

trichilemmal

 [trik″ĭ-lem´al]
pertaining to the outer root sheath of a hair.

trichilemmal

/trich·i·lem·mal/ (trik″ĭ-lem´al) pertaining to the root sheath of the hair.

trichilemmal

pertaining to the outer root sheath of a hair.

trichilemmal cyst
greatly enlarged hair follicles, filled with keratin. They resemble epidermoid cysts. Called also pilar cysts.
References in periodicals archive ?
7) Cysts derived from the overlying epidermis, hair follicles, and apocrine glands include epidermoid cysts, pilar or trichilemmal cysts, dermoid cysts, and hidrocystomas.
Tomkova H, Fujimoto W, Arata J: Expression of keratins {K10 and K17) in steatocystoma multiplex, eruptive vellus hair cysts, and epidermoid and trichilemmal cysts.
Histologically, the differential diagnosis includes basal cell carcinoma (lacks shadow cells; shows clefting around basaloid groups), neuroendocrine carcinoma such as Merkel cell carcinoma (lacks shadow cells; shows CK20 immunoreactivity), and a proliferating trichilemmal cyst (usually large squamous cells and no shadow cells).
Proliferative trichilemmal tumor is a skin neoplasm derived from a hair follicle.
Malignant proliferating trichilemmal tumor of the tower eyelid.
Proliferating trichilemmal tumor (PTT) is a rare adnexal neoplasm that arises from the outer sheath of the hair follicle.
Expression of keratins (K 10 and K 17) in steatocystoma multipleks, eruptive vellus hair cyst, and epidermoid and trichilemmal cyst.
In addition to several benign adnexal tumors, the authors (22) analyzed 4 MACs and 3 ECs (1 of the latter with mucinous differentiation) as well as a case of hidradenocarcinoma and 2 cases of trichilemmal carcinomas.
Obviously, choice of the name of this tumor is less important as long as ACCCC is appropriately recognized among more common epidermal tumors with squamoid and/or clear cell differentiation, such as squamous cell carcinoma, sebaceous carcinoma, trichilemmal carcinoma, or pilar tumors, to alert clinicians for potential aggressive growth.
13] Nodular porocarcinomas must be differentiated from squamous cell carcinoma, sebaceous carcinoma, and proliferating trichilemmal tumor.
Pathologic Diagnosis: Proliferating Trichilemmal Tumor