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腺样囊性癌乃是一种特殊类型的涎腺肿瘤。组织学上,此瘤的特征是具有筛状结构即许多囊样腔隙位于细胞岛中。囊样腔隙内含有嗜苏木精性粘液祥物,粘透明蛋白,或嗜伊红性透明蛋白并呈圆柱体状。正因为肿瘤细胞岛内存在着这些圆柱样腔隙,所以Billroth最先称此瘤为圆柱瘤。圆柱瘤是小涎腺中最多见的恶性肿瘤并具有早期侵犯神经膜的特点。
Adenoid cystic carcinoma is a special type of salivary gland tumor. Histologically, this neoplasm is characterized by having a squamous cell structure, i.e., many capsule-like compartments are located in the island of cells. The cystoid space contains hematoxylin-sensitive muco-elastic substances, muco-opaque proteins, or eosinophilic clear proteins and is cylindrical. Because of the presence of these cylindrical cavities in the island of tumor cells, Billroth first called the tumor a cylindrical tumor. Cystic tumors are the most common malignancy in the small parotid glands and are characterized by early violation of the nerve membrane.