The incidence of renal aneurysm is low, but it is still a relatively common type of visceral aneurysm. Most renal aneurysms are asymptomatic; a few may cause renal vascular hypertension, hematuria, renal infarction, lumbar and abdominal pain, etc. due to aneurysm compression. Once a renal aneurysm ruptures, it will lead to hemorrhagic shock and the mortality rate can be as high as 80%. This disease can be easily diagnosed through CT or magnetic resonance angiography, color ultrasound, etc. Feng Rui, Department of Vascular Surgery, Shanghai Changhai Hospital In recent years, more and more renal aneurysms have been detected and eventually gathered in vascular surgery centers like ours due to the improvement of imaging and diagnosis. There is no drug treatment for this disease, while the traditional surgical procedures mainly include aneurysm removal renal artery reconstruction, spring coil embolization of the aneurysm, and repair with membrane stent. However, renal artery aneurysms usually grow between the secondary and even tertiary branches of the renal artery, and these surgical procedures are extremely difficult to perform successfully because the aneurysm is deep inside the renal peritoneum and the renal hilum. For example, the location of the renal artery is so deep that it is extremely difficult to dissect out and reconstruct the blood vessels, and the kidney can easily lose its function due to intraoperative blockage of blood vessels and thermal ischemia. Another example is that the aneurysms of renal artery aneurysms are usually quite wide, and embolization by simply using ordinary free spring coils can result in ectopic embolization of renal artery branches and renal infarction. For example, the repair of renal aneurysms with membrane stents is only applicable to a very small number of renal artery trunk aneurysms. For aneurysms at the branches, not only will the branches be obscured, but also, because the delivery system of membrane stents is still quite thick, forcibly introducing them to the renal artery branches will easily cause vessel rupture, entrapment and occlusion. Due to the above mentioned problems, for many years, renal aneurysm has been one of the few most difficult to treat aneurysms, even in Changhai Hospital, it is often only observed on follow-up visits. Over the past ten years, only a few cases of renal aneurysm have been successfully treated in our hospital, among which, the most successful case was a urologist with only one kidney, who barely saved his life by removing his left kidney due to hemorrhage from a ruptured left renal aneurysm. However, the right kidney was also found to have an aneurysm after surgery. Under the leadership of Director Jing Zaiping, we, together with the urology department, removed his kidney and repaired it with great difficulty in ice water outside the body before planting it back into his body. Although the general anesthesia surgery lasted a whole day, it was very successful and the kidney function was fortunately preserved (paper A case of isolated renal aneurysm repair, renal artery reconstruction and autologous kidney transplantation for complex solitary renal renal aneurysm published in Chinese Journal of Surgery 2007, No. 18). Two such surgeries were performed, and no more were done because they were too arduous. With the advancement of endoluminal surgical techniques and instruments, from the end of 2013, I led the surgical team and explored a safe and effective minimally invasive endoluminal surgical approach to embolize the aneurysm by various bare stent-assisted approaches using controlled spring coils, which could achieve complete thrombotic mechanized atrophy of the aneurysm cavity while perfectly preserving all branch arteries and all cortical functions of the kidney. The procedure requires a high level of surgical instruments and interventional skills, but it can be done without any major effort on the patient and only requires local anesthesia. Thanks to the love and affirmation of my colleagues nationwide, I have introduced this new method more than ten times in various conferences in China over the past year, and guided hospitals in Shanghai, Wuhan, Lanzhou and Jinan to successfully complete many cases of minimally invasive renal aneurysm surgery. Due to the repeated calls and inquiries from patients in many places, I have used one hour of my time to hastily accomplish this article today, hoping that patients with renal aneurysm will understand more after reading it. At the same time, the electronic version of a booklet issued for several typical cases in last year’s academic conference is posted for the reference of patients and colleagues.