The value of MSCT in diagnosis of parotid benign tumor (An analysis of 84 cases)

作     者：Yue Dong Jianlin Wu Ying Ge 

作者机构：Department of Radiology The First Affiliated Hospital of Dalian Medical University Dalian 116011 China 

出 版 物：《The Chinese-German Journal of Clinical Oncology》 (中德临床肿瘤学杂志（英文版）)

年 卷 期：2010年第9卷第6期

页      面：349-353页

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 090601[农学-基础兽医学] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 1002[医学-临床医学] 08[工学] 09[农学] 0906[农学-兽医学] 10[医学] 

主　　题：parotid gland benign tumor computer tomography 

摘      要：Objective:The purpose of the study was to assess diagnostic performance of MSCT images in patients with parotid benign tumors and provide useful criteria for the characterization of their various pathological types preoperatively. Methods: Retrospectively analyzed clinical and imaging characteristics of 84 cases of pathologically confirmed primary parotid benign tumors. MSCT plain-scan and enhanced-scan were performed in all cases. After injection of 50 mL contrast material at a rate of 3.5 mL/s,spiral CT scans were obtained at arterial and venous phases with scanning delay of 30 s and 75 s,respectively. The attenuation change and enhancement patterns in the tumors were assessed. Quantitatively assess the increased CT number of the tumors in different enhanced-phases compared with the plain-scan and the ratio of increased CT number at venous phase scanning to that at arterial phase scanning also was calculated. Results:In all of 84 cases,40 cases were solitary pleomorphic adenomas,29 cases were adenolyphomas,6 cases were multiple tumors,2 cases were bilateral,15 cases were Basal cell tumor,and one of them had two small lesions. The diameter was 1–5 cm in most of cases,whose margin was smooth and clear,cystic changes in some cases. At two-phase scans,pleomorphic adenomas showed a pattern of slight enhancement and venous enhancement,adenolymphomas showed a pattern of strong enhancement at arterial phase scanning with a decrease at venous phase scanning,basal cell tumor showed a pattern of persistent strong enhancement with commonly significant cystic areas. The ratio of increased CT number was significant different between adenolymphomas and other pathological types. Conclusion: The evaluation of enhancement patterns at two-phase enhanced-scan MSCT is helpful in the differential diagnosis of parotid gland benign tumors.