Alzheimer’s disease group (n = 25)

Dementia with Lewy bodies group (n = 11)

p-value

Age (years, mean ± SD)

81.6 ± 5.5

81.3 ± 6.2

0.78

Sex

Male

Female

6

19

5

6

0.25

Hippocampal atrophy

25

0

<0.01

Decreased blood flow in arterial-spin labeling

16

10

0.22

Microbleeding in susceptibility-weighted imaging

7

3

1.00

Magnetic resonance angiography findings

25

10

0.31

Decreased cerebral blood flow at

posterior cingulate cortex and precuneus

16

8

1.00

Normal cerebral blood flow at the primary sensorimotor cortex

6

1

0.39

Decreased cerebral blood flow at the occipital lobe

16

8

1.00

Decreased cerebral blood flow at the occipital lobe and increased blood flow at the striatum and/or thalamus

11

7

0.47

Cingulate island signs

Present in 8 cases

Present in 5 cases

0.71