A 78-year-old grandmother in Guangzhou recently encountered a strange incident, in which she could feel a pulsating mass like a heartbeat behind both knees, and came to the vascular surgery department of the Third Affiliated Hospital of Guangzhou Medical College and found that it was an N aneurysm. The grandmother had pain in both knees for many years, causing her a lot of trouble, and in severe cases she could only walk with a limp. She thought she had arthritis and had been seeking treatment at an orthopedic hospital for years, taking numerous medications, but she never got better. Recently, her family noticed that her knees were getting swollen, and they could even feel a pulsating mass behind her knees. After being reminded of this, her family brought her to the vascular surgery department of the Third Guangzhou Medical Center for examination. One of the two N aneurysms was 4cm in diameter and the other was 4.5cm in diameter, which was 6-7 times larger than the normal diameter of blood vessels. If we follow the usual minimally invasive surgery method, we have to implant a stent in the knee joint to isolate the N aneurysm. Considering that the knee joint is a frequently moving joint, the stent will be easily displaced, so we choose the open surgery method, first ligating the blood vessel of the aneurysm, and then doing the bypass surgery with an artificial blood vessel. As the surgery was timely, it not only solved the granny’s heart disease for many years, but also avoided the risk of amputation and disability. According to statistics, aneurysms usually occur in the abdominal aorta, and patients usually feel a pulsating mass around the belly button, while N aneurysms are relatively rare, mainly due to atherosclerosis and arteritis, and are rare in young people, mainly in the middle-aged and elderly, but if careless and reckless, there is a risk of amputation. Dr. Yang Chengyu reminded that if you feel a pulsating mass like a heartbeat in a certain part of the body, you must not take it lightly and go to vascular surgery for an early examination so as not to delay the best time to cause irreversible consequences.