ANURIA secondary to renal artery embolism is encountered infrequently. Nonetheless it is important to recognize this complication promptly since it is a potentially reversible form of renal failure, assuming that successful surgical intervention can be achieved before irreversible renal damage has occurred. The purpose of this report is to describe a case of anuria secondary to renal artery embolism and to discuss the renal functional response which followed embolectomy. The case is of particular interest because of the lapse of more than four days between onset of anuria and subsequent renal revascularization. Report of a Case A 73-year-old white male was admitted to Hahnemann Hospital on Feb 6, 1963, for treatment of anuria of four days' duration. Left nephrectomy was performed in 1958 because of renal calculi and pyelonephritis. During the two years prior to his present hospital admission, he suffered from chronic atrial fibrillation and intermittent congestive heart failure.