FIG 4. A, The group with third ventricular VCSFA had significantly larger third ventricles (P < .0001) than did those without third ventricular VCSFA. For illustrative purposes, the patients are divided into categories based on small, medium, and large third ventricles.

B, The group with fourth ventricular VCSFA had significantly larger third ventricles (P < .01) than did those without fourth ventricular VCSFA. For illustrative purposes, the patients are divided into categories based on small, medium, and large third ventricles.