To assess the safety and efficacy of different endovascular techniques in the treatment of unruptured renal artery aneurysms.

The clinical data of 24 patients with renal artery aneurysms, who were treated with endovascular treatment in the First Affiliated Hospital of Nanjing Medical University from July 2013 to August 2020, was retrospectively analyzed by observing aneurysmal occlusion and patency of parent artery after different endovascular treatment for renal artery aneurysm.

A total of25 renal aneurysms were treated in 24 patients, with the mean maximum diameter of (2.3±1.0) cm and neck width of (0.8 ± 0.3) cm. The number of aneurysms treated with double microcatheter technique and stent-assisted embolization were 18 and 7 respectively. The technical success rate was both 100%. Postoperative 1-, 6- and 12-month clinical success rate of double microcatheter group and stent-assisted group were 100%, 94.4%, 95.8% and 100%, 100%, 100% respectively. Six months after therapy, small scale of asymptomatic renal infarction was discovered in one patient with double microcatheter technique and no major complication was recorded. There were no aneurysmal recurrences, occlusion of parent artery or deaths related to renal artery aneurysms during the follow-up.

Endovascular treatment is safe and effective for treating renal artery aneurysms. For renal aneurysms with narrow neck, double microcatheter technique could be chosen, otherwise, stent-assisted embolization should be performed.