Endovascular intervention is a minimally invasive technique, and the whole procedure is done only in the catheter introduced after puncturing the patient’s thigh, without opening the skull and exposing the brain tissue, and there is little bleeding during the procedure, which is not only effective, but also less painful, less traumatic and faster recovery. Cerebral aneurysm is not a tumor, but a localized abnormal expansion of the cerebral artery wall. The majority of cerebral aneurysms grow near the arterial ring (Willis ring) at the base of the brain and are associated with local weakness of the arterial wall and abnormalities in intra-arterial blood flow and blood pressure; some aneurysms have a familial tendency to develop, and these cases are often associated with other hereditary connective tissue diseases (e.g., E.D. syndrome, Marfan syndrome, etc.); cerebral aneurysms can also be associated with congenital anomalies such as polycystic kidney and aortic stenosis. Brain aneurysms can also be associated with congenital anomalies such as polycystic kidney and aortic stenosis. Symptoms of cerebral aneurysms Aneurysms are usually diagnosed when a patient seeks medical attention for a severe headache, often after the aneurysm has ruptured. Before an aneurysm ruptures, many patients are generally asymptomatic and normal. A brain aneurysm is like a “balloon” that grows on the arterial wall, which is extremely thin and prone to rupture, and is described as a “time bomb” that can explode at any time. The most serious symptom is rupture and bleeding of the aneurysm, i.e., severe subarachnoid hemorrhage (SAH), which causes a series of symptoms, including sudden severe headache, jet vomiting, head and neck straightening, diplopia, eyelid drooping, pupil dilation and numbness of expression and even loss of consciousness. Cerebral aneurysm is the most common cause of SAH, with an early mortality rate of 40%. Aneurysm rupture and bleeding are so dangerous that 10-15% of patients die before they can reach the hospital; the mortality rate of the second bleeding is 60-70%. Therefore, the aim of treatment for cerebral aneurysm is to prevent re-rupture and bleeding. If cerebral aneurysm is suspected, DSA-cerebral angiography should be done in time to clarify the diagnosis and treat it as early as possible. Minimally invasive treatment of cerebral aneurysm – endovascular intervention The emergence of electrolytic detachable microspring coils in the 1990s created a new way of minimally invasive endovascular treatment of cerebral aneurysm. The material used to occlude the aneurysm is an extremely fine and soft (hair-thin) memory microcoil made of platinum. The microsprings are placed into the aneurysm through a microcatheter and then released to occlude the aneurysm, which is harmless to the body and generally not uncomfortable for the patient. The technique is performed by a specially trained neurosurgeon in a radiology digital subtraction angiography (DSA) suite. The patient can be treated with local or general anesthesia and the procedure usually takes 1 to 2 hours.