The circle of Willis ... The most common structural difference was the absence of a posterior ... D. G., & Junior, O. F. R. (2012). Variations in the brain circulation —the circle of Willis ...

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 ...

Incomplete Circle of Willis More Common in Subjects with Migraine (IMAGE) University of Pennsylvania School of Medicine ...