患者女,15岁。因反复发作性右下腹疼痛,每次抗菌素治疗有效,诊断为慢性阑尾炎。入院要求手术治疗。术前常规腹部彩超检查发现胰头后方、下腔静脉前方,右肾内侧上方有一6cm×2.9cm的低回声团,边界清晰,内部回声均匀(图1),其内未见彩色血流信号。超声诊断:腹膜后实质性肿物。手术 Female patient, 15 years old. Due to repeated episodes of right lower quadrant pain, each antibiotic treatment effective, diagnosis of chronic appendicitis. Admission requires surgery. Preoperative routine abdominal ultrasonography revealed that there was a 6 cm × 2.9 cm hypoechoic mass in front of the posterior pancreatic head, inferior vena cava and inside of the right kidney with a clear boundary and uniform internal echo (Fig. 1). No color flow signal was seen in it. Ultrasound diagnosis: retroperitoneal substantive tumor. surgery