2020 Volume 40 Issue 2 Pages 187-193
We report a case of DLB with remarkable asymmetry showing a decrease in right hemisphere dominance. In this case, it is assumed that the patient inferred the whole drawing from looking at a part of it since response time to recognize multiple items was delayed. Therefore, this case showed ventral simultanagnosia. The visual cognitive impairment seen in this case was also thought to be due to right hemisphere impairment. It was suggested that if one of the occipital lobes was not disturbed by the remarkable asymmetry, it was suggested that basic visual impairment was mild, whereas various visual cognitive dysfunctions were observed.
We compared a large number of DLB and AD patients using IMP-SPECT to clarify the degree of left-right difference (LRD) and where in the brain LRD existed. LRD in DLB was less frequent than in AD. In DLB, there was a difference between left and right in occipita (ltongue gyrus, cuneus) and posterior temporal lobe.
