The images (slices) shown for comparison are not of the same area of the brain. It’s like interpreting an elbow x-ray for a fractured wrist.
Keep telling yourself that.
I have been teaching anatomy for over 20 years and the pictures look like they are from the same area to me. They are transverse and saggital sections of the lateral ventricles of the brain which are found within the cerebral hemispheres. Although the ventricles are normally fairly small (as shown in the normal brain scan), they are filled with cerebrospinal fluid. Terri Schiavo definitely appears to have had less fluid and more intact brain tissue than this man does.