The circle of Willis is a junction of several important arteries at the bottom part of the brain. Learn more about its anatomy, function, and more.

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 carotid and the posterior cerebral arteries.

The driver of the car that hit a CTA bus, which then crashed into a bank at the base of Willis Tower early Saturday morning, has been cited, police said. Around 1:55 a.m., the car, which was southb… ...

With a carotid stent, dilation balloon, and integrated embolic protection (IEP) filter for added safety, the system also ...

A CTA bus crashed several feet into a wall of the Willis Tower early Saturday after colliding with a wrong-way driver in the Loop. The crash happened shortly before 2 a.m. when a driver headed the ...