Medically reviewed by Nicholas R. Metrus, MD The posterior communicating artery (PCOM) is a part of a group of arteries in the brain known as the circle of Willis. The artery connects the internal ...

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.

The image depicts the anatomy of the circle of Willis (A) ... Pcomm: posterior communicating artery; A1, A2, P1, P2: branches of the anterior and posterior cerebral arteries.

The image depicts the anatomy of the circle of Willis (A) ... artery; A1, A2, P1, P2: branches of the anterior and posterior cerebral ... to the intracranial arterial supply. view more .

Thus, the rate of rupture is directly related to the size of the aneurysm.. Aneurysms usually occur at arterial bifurcations and mostly arise from the anterior circulation of the Circle of Willis (85% ...

Thus, the rate of rupture is directly related to the size of the aneurysm.. Aneurysms usually occur at arterial bifurcations and mostly arise from the anterior circulation of the Circle of Willis (85% ...