腮腺多形性腺瘤癌变占腮腺上皮性肿瘤发病数的9.3%左右。其恶变的病因尚未完全了解,但从临床观察与资料报导看来,显然与肿瘤生长部位,体积大小,病程长短,生长方式等因素有着密切的关系。因此在决定治疗方案的同时,将上述因素共同考虑在内,进行术前临床分期, Parotid pleomorphic adenoma cancer accounts for about 9.3% of the incidence of parotid epithelial tumors. The cause of its malignant transformation is not yet fully understood, but from the perspective of clinical observation and data reports, it is obviously closely related to factors such as tumor growth site, volume size, duration of disease, and growth pattern. Therefore, while deciding the treatment plan, the above factors should be taken into consideration and preoperative clinical staging should be carried out.