Abdominal aortic aneurysm and horseshoe kidney in a 91-year-old man.

A 91-year-old man had a symptomatic, enlarging abdominal aortic aneurysm in association with horseshoe kidney. He underwent successful surgical resection. Difficulties, secondary to the inter-relationship of the renal artery supply and the aneurysm, are discussed. This patient is 15 years older than the previously oldest reported patient with these two associated anomalies.