ELN and Alzheimer disease: In Verhoff’s elastin-stained section, the elastin area fraction were 0.15 (range, 0.08 to 0.19), 0.07 (range, 0.04 to 0.09), 0.14 (range, 0.10 to 0.17), and 0.08 (range, 0.06 to 0.11) in the C group, the AD group, the CA group, and the CA + AD group, respectively.