For instance, a change in the anterior communicating artery may keep the circle of Willis from being complete. A few different changes are possible here, including fenestration and duplication.

A number of individuals have a normal anatomic variant known as a persistent fetal circulation, wherein the PCA arises directly from the posterior communicating artery off the internal carotid artery.

The anterior cerebral artery supplies blood to parts of the frontal and parietal lobes of the brain. Also known as the ACA, it is one of a pair of arteries essential to delivering oxygen to the brain.

Aneurysms of the aorta are known to occur in syphilis, but a cerebral aneurysm secondary to syphilitic vasculopathy has been reported only once, in a patient with an aneurysm of the posterior ...

Thus, an embolus at the top of the internal carotid artery can then infarct the middle cerebral and posterior cerebral artery territories. The internal carotid artery terminates in a larger MCA and ...