目的 探讨慢性腹主动脉周围炎(CP)的影像表现及临床治疗效果。方法 回顾性分析5例CP患者的资料，分析其影像 表现及治疗效果。结果 CT表现为包绕腹主动脉的软组织密度影，MR表现为等或稍长T1短T2信号或稍长T2信号，增 强扫描见轻度强化，所有患者均伴有单侧或双侧肾盂积水；2例接受了腔镜下输尿管松懈术，在糖皮质激素及免疫 抑制剂治疗基础上，2例接受了腔镜下输尿管松懈术，1例接受了下腔静脉支架放置术。结论 影像学是诊断CP的主 要手段之一，糖皮质激素及免疫抑制剂效果满意。

Objective To explore the imaging features and treatment effect of chronic periaortitis (CP). Methods Imaging and clinical treatment of 5 patients with CP were retrospectively analyzed. Results CP presented as periaortal lesion with soft tissue density on CT, and iso- or slightly long T1 and short or slightly long T2 intensity on MRI, after contrast medium enhancement, there was slightly enhancement in lesion. All patients were concurrence with unilateral or bilateral hydronephrosis. After administration of glucocorticosteroid and immunosuppressant, 2 patients underwent laparoscopic ureterolysis, 1 patient underwent stenting of inferior vena cava. Conclusion Imaging is one of the main diagnoses for CP, and glucocorticosteroid and immunosuppressive medication is effective for CP.