FIG 5. A, The pathophysiology of atrophy. Straight black arrows indicate the magnitude of the pulsations; white arrow near the SSS, volume of CSF leaving the system through the incisura of the tentorium; curved black arrows between the capillary beds, bulk fluid flow; SSS, superior sagittal sinus; ST, straight sinus; V, ventricle.

B, The pathophysiology of NPH. Straight black arrows denote vessel pulsation magnitudes; curved black arrows, interstitial fluid bulk flow; white arrow, CSF flow; SSS, superior sagittal sinus; ST, straight sinus; V, ventricle.