The left embryonic posterior cerebral artery is a common variant in which the anterior segment of the posterior cerebral artery without traffic continues directly with the posterior cerebral artery, and this condition does not increase the incidence of cerebral infarction, so do not worry too much. However, when the occipital lobe is infarcted, the collateral circulation may not be established with it, which will aggravate the damage of cerebral infarction, so it is still very necessary to treat cerebral infarction actively. For the diagnosis of embryonic posterior cerebral artery, magnetic resonance imaging or ultrasound and digital subtraction angiography should be performed to determine the condition of the posterior cerebral artery, and if cerebral infarction is produced, active treatment should be given to reduce the degree of damage of cerebral infarction, stabilize emotion, and review regularly, etc.