The sequelae of cerebrovascular malformation intervention are actually divided into two major aspects, as follows: 1. Ischemia: In the process of embolization, the normal blood supply arteries, i.e., the passing vessels, are at risk of being misembolized. If these vessels are not very important vessels, the problem is not serious, but once the vessels in the functional area are misembolized, the patient may experience hemiplegia, aphasia or retardation, language impairment, and other problems in the application center; 2. Hemorrhage. Once the bleeding damages the brain tissue, the patient will have relative symptoms, including coma, hemiparesis, aphasia, and even life-threatening. Hemorrhage often causes very serious brain swelling as well as brain herniation, which can be life-threatening in severe cases.