The following CT scan of Terri Schiavo purportedly suggests that her cerebral cortex consisted entirely of fluid at the time the image was made many years ago. http://www.miami.edu/ethics2/schiavo/CT scan.png I'm skeptical of the claim because the image is too symmetrical. An injury condition would be more likely to produce damage without a pattern. Also there is the problem of getting the cellular debris out of the area and replacing it with fluid only. I'm also skeptical of reliance on a CT scan which isn't particularly reliable on soft tissue.