目的探讨腮腺肿瘤的MSCT 表 现，分析误诊原因，提高诊断水平。方 法 回顾性分析手术病理证实的83例腮腺 肿瘤患者CT 资料，探讨其MSCT表现并分 析误诊原因。结果 良性61例，恶性22 例；良性肿瘤多位于浅叶，边界多清晰 光滑，持续或渐进性强化多见，腺淋巴 瘤早期明显强化；混合瘤、血管瘤可见 钙化，腺淋巴瘤囊变多见。恶性肿瘤多 位于深叶，具恶性肿瘤一般特点。CT误 诊9例：2例腺淋巴瘤、1例良性肌上皮瘤 及1例海绵状血管瘤误诊为混合瘤，1例 混合瘤误诊为血管瘤，1例基底细胞腺 瘤误判为恶性，3例边界清楚长径小于 2.5cm的恶性肿瘤误判为良性。结论 腮 腺肿瘤MSCT能准确定位并判定良恶性， 大部分可术前明确诊断；部分表现不典 型或互有重叠，拘泥于好发部位、性别 年龄等均可成为误诊原因。

Objective To investigate the MSCT features of parotid tumors and to analyze the causes of misdiagnosis and improve the diagnostic level. Methods The MSCT findings of 83 patients with parotid tumors proved by surgery and pathology were analyzed retrospectively. The MSCT findings and the causes of misdiagnosis were analyzed. Results 61 cases were benign, and the other was malignant in 22 cases. Benign tumors were located in the superficial lobe, and the border was clear and smooth, persistent or progressive intensification, adenolymphoma was enhanced obviously in the early phase, calcification could be found in pleomorphic adenoma and hemangioma, most adenolymphomas were with cystic change. Most malignant tumors of parotid were located in the deep lobe, with the general characteristics of malignant tumors. CT misdiagnosis in 9 cases: 2 case of adenolymphoma, 2 case of myoepithelioma and 1 case hemangioma were misdiagnosed as pleomorphic adenoma, 1 case pleomorphic adenoma was misdiagnosed as hemangioma,1 case basal cell adenoma was misdiagnosed as malignant tumor,3 cases of malignant tumors with clear boundary length of less than 2.5cm misdiagnosed as benign. Conclusion MSCT can accurately locate and determine the benign and malignant tumors of parotid gland, most of them can be diagnosed before operation, some of them are not typical, and overdependence on predilection sites, gender, age, etc will lead to misdiagnosis.