Giant aneurysm of the renal artery is rare even though renal artery aneurysms are diagnosed more often since the introduction of abdominal ultrasonography and selective renal arteriography. A 52-year-old man with an aneurysm of the left renal artery measuring 16 x 13 x 10 cm presented with features of an expanding aneurysm. He underwent resection of the aneurysm and a left nephrectomy.