Memory deficit, Alzheimer's disease

Memory deficit, Alzheimer's diseasePatient with memory deficit, Alzheimer's disease.
Brain perfusion with 99mTc-ECD shows bilateral temporoparietal hypoperfusion.Different perfusion patterns have the following probabilities of AD:

Normal: 19%

Bilateral temporoparietal hypoperfusion: 82%

Bilateral temporoparietal hypoperfusion and other defects: 77%

Unilateral temporoparietal hypoperfusion: 57%

Frontal hypoperfusion: 43%

Other large defects: 18%

Multiple small defects: 0%

Case Alzheimer's disease courtesy Holman BL, Johnson KA via Radiopaedia.org