β-Amyloid (Aβ) deposition in regions of the temporal lobe in patients with dementia with Lewy bodies (DLB) was compared with elderly, non-demented (ND) cases and with Alzheimer’s disease (AD). The distribution, density and clustering patterns of diffuse, primitive and classic Aβ deposits were similar in ‘pure’ DLB and ND cases. The distribution of Aβ deposits and the densities of the diffuse and primitive deposits were similar in ‘mixed’ DLB/AD cases compared with AD. However, the density of the classic deposits was significantly lower in DLB/AD compared with AD. In addition, the primitive Aβ deposits occurred more often in small, regularly spaced clusters in the tissue and less often in a single large cluster in DLB/AD compared with ‘pure’ AD. These results suggest that pure DLB and AD are distinct disorders which can coexist in some patients. However, the Aβ pathology of DLB/AD cases is not identical to that observed in patients with AD alone.

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