1. A method for providing a tool for analyzing a saccular aneurysm affixed to a blood vessel, comprising: obtaining an image of the saccular aneurysm affixed to the blood vessel with a medical imaging device; separating an image of the saccular aneurysm from the image of the saccular aneurysm affixed to the blood vessel, wherein the saccular aneurysm is separated from the blood vessel at a neck of the saccular aneurysm; mapping a surface of the separated image of the saccular aneurysm onto a homeomorphic equivalent template, such template being a unit disc and topologically equivalent to the surface, wherein a boundary of the unit disc corresponds to points of the neck of the saccular aneurysm.