MAPT and Alzheimer disease: A significant difference was seen in the number of VENs between molecular groups (F[4] = 6.43, p < 0.001), and compared to controls, the FTLD‐TDP and FTLD‐FUS groups showed a significantly lower number of VENs (p = 0.001 for both), which was not seen in FTLD‐tau (p = 0.06) and AD (p = 0.96) (Figure 2C).