cylindroma

A histologic type of epithelial neoplasm, frequently malignant, characterized by islands of neoplastic cells embedded in a hyalinized stroma which may represent a thickened basement membrane; may form from ducts of glands, especially in salivary glands, skin, and bronchi; in the salivary glands, also termed adenoid cystic carcinoma. SYN: cylindroadenoma. [G. kylindros, cylinder, -oma, tumor]

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cyl·in·dro·ma .sil-ən-'drō-mə n, pl -mas also -ma·ta -mət-ə a tumor characterized by cylindrical masses consisting of epithelial cells and hyalinized stroma:

a) a malignant tumor esp. of the respiratory tract or salivary glands

b) a benign tumor of the skin and esp. the scalp

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cyl·in·dro·ma (sil″in-droґmə) [cylinder + -oma] 1. a type of benign adnexal tumor, thought to be of sweat gland tissue, usually on the scalp (see turban tumor), but occasionally on the face or limbs. It consists of single or multiple nodules with cylindrical epithelial masses containing small basophilic and larger pale-staining cells surrounded by pink hyaline sheaths. Some authorities consider this a form of trichoepithelioma. 2. multiple trichoepithelioma. 3. adenoid cystic carcinoma. cylindromatous adj