Does Ultrasonic Cavitation remove fat cells / adipocytes permanently from the body or just shrink them?

and then its permanently removed. At least that's my understanding. Cavitation is like a stream of tiny bubbles that are given off my an ultrasound probe. It works best in a wet environment so we still "tumesce" the area first. As for your other point, yes the cells that are left can get bigger or smaller as you gain or lose weight.