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关于涎脲肿瘤的恶性问题尚有争论的有两类:即单形态腺瘤(Monomorphic Adenoma)与高分化粘液上皮样瘤。这两类肿瘤主要出现于口腔,而口腔粘液上皮样瘤较之腮腺粘液上皮样瘤的发生还高四倍。核脱氧核糖核酸(Nuclear DNA)含量的增加,一般认为是多数恶性瘤细胞的特征
There are two controversial issues concerning the malignancy of urea-urea tumors: Monomorphic Adenoma and well-differentiated mucoepidermoid tumors. These two types of tumors mainly occur in the oral cavity, and oral mucoepidermoid tumors are four times higher than those of salivary gland mucoepidermoid tumors. The increase in the nuclear DNA content is generally considered to be the characteristic of most malignant neoplastic cells.