Dr. John Detre, the study’s senior author, adds: “Abnormalities in both the circle of Willis and blood flow were most prominent in the back of the brain, where the visual cortex is located.” ...

Migraine with Aura Is Associated with an Incomplete Circle of Willis: Results of a Prospective Observational Study. PLoS ONE , 2013; 8 (7): e71007 DOI: 10.1371/journal.pone.0071007 Cite This Page : ...

The brain and the 'Circle of Willis' are examined at autopsy. Thickening of arteries due to atherosclerosis, bursting of aneurysm and haemorrhage of brain are seen at autopsy.