The posterior communicating artery (PCOM) is a part of a group of arteries in the brain known as the circle of Willis ... TBIs are usually diagnosed by a CT scan or MRI. Treatment may include ...

Watershed Infarction: Axial CT scan. Note the large hypodensity in the left basal ... of a proximal artery without intact collateral vessels (e.g., an incomplete circle of Willis), with or without ...