Despite all recent advances, the most important progress in neuroradiol- ogy has been in our knowledge of the anatomy of the nervous system. DANDY'S injection of ventricles and cisterns with air, SICARD'S studies of the epidural and subarachoid space with lipiodol, MONIZ'S work on cerebral arteries and veins, and, more recently, DJINDJIAN'S and DI CHIRO'S investiga- tions of spinal arteries, have modified, refined and expanded current knowl- edge...