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We report an elderly case who had demonstrated progressive memory disturbance and disorientation for 4 years. The clinical features were indistinguishable from late-onset dementia of the Alzheimer type (DAT). Neuropathologically, however, senile plaques (SPs) were almost absent throughout the brain. In contrast, numerous neurofibrillary tangles (NFTs) were observed in the hippocampus and neighboring regions, with much higher density than age-mateched normal controls. The immunohistochemical and ultrastructural properties of the NFTs were identical to those of typical DAT. The present case is histologically different from DAT because of the scarce SPs and indicates that numerous NFTs in the hippocampal region can be formed independently of the existence of SPs.

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Transparent 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 (PMN‐PT) based ceramics were prepared by a conventional solid‐state synthesis without using a hot‐press method. The ceramics became transparent when they were sintered in an O2 atmosphere. The optical transmission increased with decreasing diameter of the calcined powder, which was controlled by the size of zirconia ball‐milling media. Substitution of 3 mol% La for Pb in PMN‐PT further increased the optical transmission to 68% at the wavelength of 2000 nm, which was comparable to that of hot‐pressed Pb(Mg1/3Nb2/3)O3‐PbTiO3 based transparent ceramics.