Carotid angiography (1) has become an established and increasingly popular procedure in neuroradiology. For diagnostic purposes, most of the emphasis has been placed on changes in the arterial phases. This paper is presented to emphasize the importance of changes in the deep veins of the brain. With serial filming, the deep veins are regularly visualized from four to six seconds after injection. If films are taken at one-second intervals, the deep veins are usually seen in two successive frames. Our present procedure is to take seven films in eight seconds, since the intracranial circulation may be slow in the presence of increased intracranial pressure. Normal Anatomy The normal anatomy of the pertinent deep veins is represented in Figures 1–4. No attempt to describe it in detail will be made. Several venous tributaries seen only occasionally are not illustrated. These include: (1) a posterior epithalamic vein which appears to arise near the pulvinar and joins the internal cerebral vein a short distance ...