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.

As part of the lower half of the circle of Willis, the PCOM artery starts from the internal carotid artery (ICA) and joins the internal carotid and the posterior cerebral arteries (PCA). It is ...

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 ...

With a carotid stent, dilation balloon, and integrated embolic protection (IEP) filter for added safety, the system also allows for three steps in one, minimizing manipulation of balloons and stents ...

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… ...

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 ...