The majority of patients with left-sided embryonic posterior cerebral artery are asymptomatic, while a few patients may have symptoms of insufficient cerebral blood supply. Left-sided embryonic posterior cerebral artery belongs to the congenital cerebral vascular development abnormality, which is caused by the abnormal development of blood vessels during the development of the embryo, most patients have left-sided embryonic posterior cerebral artery without clinical symptoms. However, a small number of patients with left-sided embryonic posterior cerebral artery will have headache, dizziness and other symptoms of insufficient blood supply to the brain. If patients with left-sided embryonic posterior cerebral artery have no symptoms, they can be left untreated, but they should have regular checkups and maintain emotional stability. If patients develop symptoms of insufficient cerebral blood supply, they need to use calcium channel blockers such as nimodipine and verapamil under the guidance of doctors. For patients who develop cerebral aneurysms, they also need to be treated with surgical interventional embolization or surgical clamping. It is recommended that clinical symptoms of left embryonic posterior cerebral artery require prompt medical attention, and can be treated with appropriate measures under the guidance of a doctor.