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This stock medical exhibit features a comparison between the anatomy of the circle of willis as a berry aneurysm grows and eventually ruptures. The first illustration shows a female head and neck scaled to relative human size. The brain and associated arteries are shown hosted behind the face to show their relative position in the head. The second illustration shows and enlargement of the normal anatomy of the anterior and posterior communicating arteries within the brain. The third illustration shows the formation of a berry aneurysm on each of the communicating arteries before the rupture. The final illustration shows the collapse of the aneurysms following their rupture. A small inset is included next to each of the anatomical images to provide the relative life size of these regions within the head.