What is the difference between anyurysm and vasolidation?

Aneurysm : Aneurysm - this is an anatomical enlargement , (abnormal) in a blood vessel, either congenital or developed from high blood pressure. Vasodilation is often a normal physiological, dynamic, changing size of blood vessels that fill with blood under certain conditions like heat, emotional stress, chemical or pharmaceutical stimulation, etc. It doesn't remain enlarged or dilated.

A lot: Aneurysm the entire three layers of the blood vessel has enlarged to a substantial degree usually 2-2.5 times normal size- called dilation of the entire blood vessel. Veins can become aneurysmal also. Vasodilation is a term for capillary dilation and low peripheral resistance and has nothing to do with aneurysm. A fluke of the english language.