Cerebral Angiography by the injection of contrast medium into the carotid or vertebral arteries provides an adequate and dependable method for the demonstration of the intracranial arterial system. As a result of many detailed studies, the variations of the arterial system of the brain both in the normal and in the diseased state are now well established. On the other hand, studies of the cerebral veins and dural sinuses are few, and their normal and pathological variations are generally unknown. While roentgenograms taken in the so-called venous phase after injection of a contrast medium via the arterial route may demonstrate some of the cerebral veins and sinuses, visualization is often incomplete and difficult to interpret. In an attempt to demonstrate the intracranial venous system more satisfactorily, we have employed several methods of investigation, including (1) direct injection of a contrast medium through a catheter introduced into the anterior third of the superior sagittal sinus; (2) retrograd...