腮腺腺淋巴瘤的MRI诊断与鉴别诊断

MRI diagnosis And differentical diagnosis of parotid adenolymphomas

目的探讨腮腺腺淋巴瘤MRI表现特点,评价MRI对其诊断价值。方法回顾性分析经手术病理证实的18例腮腺腺淋巴瘤MRI特征性表现,影像学重点分析包括病灶的数目、部位、大小、形态、边缘、信号、强化特征等。结果 18例腮腺腺淋巴瘤患者中,男16例(94.4%),女2例,50岁以上14例(77.8%);18例患者中共发现32个病灶,单侧单发10例,单侧多发5例,双侧多发3例,32个病灶中26个位于腮腺浅叶后下方;病灶一般呈圆形或椭圆形,边界清楚、光滑;T1WI多表现为等、稍高信号,T2WI及压脂T2WI均为混杂信号,增强后表现为轻中度强化。结论 50岁以上的男性患者,MRI发现腮腺浅叶的后下象限病灶,边界清楚,有轻中度强化,尤其多发者,诊断时应先考虑腮腺腺淋巴瘤。

Objective To investigate the MRI characteristics of the parotid adenolymphomas and evaluate the diagnostic values of MRI.Methods The MRI characteristics of 18 patients with adenolymphomas in parotial were restospectively analyzed.The imaging characterisitics analysis included the position,number,size,shape,intensity of signas and enhance characterisitics of the focus.Results Among 18 patients,16 were male and 2 were female.A total of 14（77.8%） were over 50 years old.10 were solitary and 8 were multiple lesions.26 lesions located in the posterior and inferior quadrant.On MRI,lesions were round,oval in shape,well-defined,presenting as intermediate or high signal intersity on T1WI;hetergencous high and intermediate signal intensity on T2WI or FS T2WI,and signal to marked mild or moderate enhancement after contrart administration.Conclusion Adenolymphomas of the parotid should be first considered when the male patient over 50 years has lesions located in the posterior and inferior quadrant and with well-defined border,especially when the lesion is multiply or biraterally located.