Arteriovenous fistulae between abdominal aorta and inferior vena cava or between common iliac vessels are uncommon. These fistulae are formed (1) by rupture of an aortic aneurysm into the vena cava, (2) as a result of a stab or gunshot wound of the abdomen, or (3) following an operation for a herniated nucleus pulposus. Of the 19 fistulae collected and reported by DeBakey et al.,1 9 were the results of disc operations. The Neurosurgical Section at the Bronx Veterans Administration Hospital has made follow-up examinations on the patients who had disc operations at this institution2 since 1946. One hundred sixty patients who had this operation between 1951 and 1959 were contacted, and ninety-one reported for examination. None of the 91 patients showed evidence of an arteriovenous fistula. Because of the rarity of this condition, the following case is reported. Report of Case A 42-year-old male postal clerk was