As we age, various diseases pose a threat to our health, especially cerebrovascular diseases. Due to various factors in our life, our blood vessels will deposit a lot of garbage, just like the water pipes that are in disrepair, there will be a lot of impurities inside. If not cleared in time, the plaque will become bigger and bigger, making our blood vessels become increasingly narrow or occluded, affecting our blood supply to the brain. The carotid artery is the necessary channel to connect the body and head, most of the blood in the body will gather here, and most of the blood waste will also flow through the carotid artery, however, compared to other arteries, it presents a unique Y-shaped, Y-shaped bifurcation, the blood vessels will be subject to greater impact, blood flow will naturally slow down, so blood impurities will easily accumulate in the carotid artery to form plaque, causing congestion, until the final blockage. However, a few patients may have one side of the carotid artery blocked and the other side narrowed, so what if a patient has one side of the carotid artery blocked and the other side narrowed? If one side of the carotid artery is blocked and the other side is narrowed, cerebrovascular bypass surgery can be performed on the blocked side of the carotid artery, and carotid endarterectomy can be performed on the narrowed side of the carotid artery 3 months later. The common goal of both procedures is to restore blood flow to the patient and restore blood supply to the brain.