FIG 1. Subject 4: watershed ischemia.

A, T1-weighted image shows hypointensity bilaterally in the anterior and posterior watershed areas.

B, T2-weighted image shows hyperintensity in the same areas, suggesting edema.

C, Anisotropic diffusion-weighted image (z gradient) shows corresponding signal hyperintensity.

D, Isotropic ADC map confirms a decrease in water diffusion with hypointensity in all watershed regions, most prominently seen in left posterior watershed area.