Untreated disease is extremely dangerous. The lack of awareness of smog has resulted in the majority of smog patients not being diagnosed and treated in a timely manner. If smog is not treated in a timely manner, about 1/4 of pediatric patients will develop intellectual or motor dysfunction, and 65%-82% of adult patients will suffer from cerebral ischemia or cerebral hemorrhage several times within 5 years, and the danger will become greater and greater. Therefore, early detection and timely treatment are very important.
In most cases, the prognosis of the disease depends on the natural progression of the disease, which is related to the age of onset, the primary cause, the severity of the disease, the degree of brain tissue damage, and other factors. Whether the treatment is timely and appropriate also has a certain impact on the prognosis. The prognosis is generally considered to be good, with a low mortality rate and few sequelae. The mortality rate is 1.5% in pediatric patients and 7.5% in adults. 30% of pediatric patients may be left with mental retardation and adults with intracranial hemorrhage have a high mortality rate, but most of them do not have sequelae if the coma period is passed quickly. From the radiological point of view, the natural course of the disease is mostly from one to several years, and once the cerebral base artery ring is completely occluded, the development of the lesion stops when the collateral circulation has been established, therefore, the overall prognosis is still optimistic.