People in comas show brain activity in the cerebral cortex is what I was trying to say - if I used wrong terminology so be it. Being in a coma is recoverable - PVS almost never is - cases where there is recovery means that the person was not ina PVS and it was a misdiagnosis.
But PVS is misdiagnosed 43% of the time.
That's why MRI and PET scans should be done, to assist the diagnosis.