1临床资料患者男，75岁,于入院前3天无意中发现右下腹鸭蛋大肿物，无明显疼痛及不适。体检：右下腹可触及一直径约5cm肿物，质硬，边界清楚，活动，压痛不明显。MRI检查示：右侧腹膜后可见一不规则形肿物影，T1WI上病灶外周呈低信号，而中央部分呈较高信号，T2WI上病灶外周呈较 1 clinical data Male, 75 years old, 3 days before admission inadvertently found the right lower quadrant duck egg mass, no obvious pain and discomfort. Physical examination: the right lower quadrant can reach a diameter of about 5cm tumor mass, hard, clear boundary, activity, tenderness is not obvious. MRI examination showed: the right retroperitoneal irregular shape of the tumor can be seen on the T1WI lesion showed a low signal on the periphery, while the central part of the signal was higher, T2WI lesions were more peripheral lesions