MRI-BASED QUANTITATIVE ASSESSMENT OF THE HIPPOCAMPAL REGION IN VERY MILD-TO-MODERATE ALZHEIMERS-DISEASE

We investigated the hippocampal region in six patients diagnosed with possible Alzheimer's disease (AD), eight patients with probable AD, an d eight age-matched controls, using a high-resolution magnetic resonan ce imaging technique. Coronal T1-weighted images were used for area me asurements of the hippocampal formation (HF), parahippocampal gyrus (P HG), and temporal lobe (TL), normalised to cranial area. Both the norm alised HF and PHG were significantly smaller in both AD groups than in the controls, but did not differ between patients with possible and p robable AD. The normalised TL was significantly smaller in patients wi th probable AD than in those with possible AD and controls, but did no t differ in patients with possible AD and controls. We conclude that h ippocampal and parahippocampal atrophy occurs in early AD, and is more useful than neocortical atrophy for early detection of the disease. A t a more advanced stage, the neocortical area is involved.