What is an artery infundibulum in the brain?

Dilation of vessel: An infundibulum is a slight bulging or dilation of a vessel as it branches off of another vessel. There is some debate as to whether these are precursors to cerebral aneurysms, but most do not feel that they are, as there is no true neck or outpouching. The treatment is observation and possible follow-up mr angiograms or conventional angiograms to make certain they do not increase in size.

Branches from: Circle of willis , all the brain its appendages , like pituitary stock also called infundibulum , all get blood supply from internal carotid, vertebral artery confluence the circle of willis.