Intracranial aneurysm is an aneurysmal protrusion of the arterial wall caused by abnormal dilatation of the inner lumen of the arterial vessels in the skull. Once ruptured, it can lead to subarachnoid hemorrhage and has a high mortality rate, which is a serious threat to the patient’s life. The main manifestation is a sudden and severe headache. Currently, the main treatment options for intracranial aneurysms are conservative drug therapy, microsurgery and interventional embolization. Preventing aneurysm rupture and bleeding and choosing the appropriate treatment modality are important to improve the cure rate and reduce the death and disability rates. Endovascular intervention is to block the aneurysm cavity with embolic material through human blood vessels to achieve the treatment purpose. Although the history of endovascular intervention is only about 30 years, with the advancement of embolization materials and operation level in recent years, endovascular interventional embolization has become a scientific and reliable treatment modality. The advantages of interventional treatment are smaller incision and shorter operation time compared with open surgery, which is more suitable for aneurysms with complex anatomy and difficult operation as well as for patients who cannot tolerate surgical treatment. However, interventional surgery is expensive, has a high recurrence rate (about 20-30%), and carries a high surgical risk. Microsurgery has been used for a long time to treat aneurysms and is the most mature and reliable treatment method. With the development of microscopic techniques, surgery under a high magnification microscope allows clamping of aneurysms under direct visualization of the naked eye while maximizing the protection of brain tissue. Compared with interventional surgery, the 5-year cure rate is the same, while the recurrence rate is less, and the cost is lower. However, a higher level of skill is required of the surgeon. For both procedures we recommend them in parallel. In case of subarachnoid hemorrhage due to aneurysm, you should be referred to a high-level medical unit as soon as possible and choose a reasonable treatment according to your condition after following the doctor’s advice. The Neurosurgery Cerebrovascular Disease Unit of the First Hospital of China Medical University is a mature and efficient medical team with first-class microsurgical operation techniques and interventional embolization techniques in China, especially it can perform the international leading composite surgery (combining microsurgical techniques with interventional techniques to treat complex cerebrovascular diseases) and has rich experience in treating complex aneurysms. Every year, we treat nearly 1,000 patients with subarachnoid hemorrhage caused by aneurysm.