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You asked on another thread if there was any way to make a PET scan more conclusive...
The reason why some scans are deemed inconclusive is due to how the damage to the brain is occurring which then can make a diagnosis suspect. If diagnosis is inconclusive then the meds prescribed for one dementia are not helpful for another type.
As to my DH, a few years after his diagnosis, his neurologist was (and his cardiologist who would capture brain images in his vascular scans) concerned after a scan showed a more uniformed damage image...not helter skelter. He was leaning towards FTD due to the way the damage was occurring and the way he was declining. The spinal tap show high levels of the proteins for ALZ so his diagnosis was not changed. His decline has followed the path of the guidelines in the 7 stage model.