When it comes to smog disease, some people associate it with the first two words “smog”, and others associate it with regular smoking, but such subjective perceptions are misconceptions. Smog, a rare cerebrovascular disease worldwide, is mainly due to chronic progressive narrowing or occlusion of the major arteries of the brain, resulting in the growth of a network of small abnormal blood vessels that look more like smoke during imaging, hence the name smog. Many people may not have heard of smog, and some primary health care workers in remote and backward areas know little about it, which leads to many patients not being detected or misdiagnosed in time, thus delaying the disease. However, with the development of medical imaging technology in recent years, many primary care hospitals can also carry out CT, MRI and even whole brain angiography, and the incidence and detection rate of smog disease has gradually increased, which has caused many patients to fall into a state of worry and anxiety, because many people have heard of this disease for the first time, and because it is a rare disease, treatment methods are relatively The results of treatment are not satisfactory. In fact, there was a time when medical treatment for smog was not very effective. However, with advances in medicine, smog can now be treated very well with bypass surgery. How does bypass surgery for smog work? There are three types of bypass surgery for smog, namely direct bypass, indirect bypass, and combined vascular bypass surgery, of which direct bypass and indirect bypass have limited scope to improve blood supply and also have the risk of stroke. After years of exploration, the clinical community has found that combined vascular bypass surgery is effective in the treatment of smog, combining direct bypass and indirect bypass in one surgery, through indirect bypass (multi-factor patching) to further improve the disadvantages of the scope of blood supply of a single bypass, to achieve multi-faceted improvement of cerebral blood supply, while the direct bypass compensates for the slow effect of indirect bypass, greatly reducing the risk of cerebral infarction. thus effectively treating smog disease.