Abstract
A 72-year-old man presented with acute abdominal pain from the left lateral to the left lower quadrant. His medical history included hypertension and hyperthyroidism. Four days after the onset, abdominal computed tomography revealed left hydronephrosis and a solitary left common iliac aneurysm obstructing the left ureter. The irregularity of the pelvic border made us suspect injuries to the left pelvis. We diagnosed acute left hydronephrosis, caused by the ureteral obstruction due to the left common iliac aneurysm. The aneurysm was replaced with a prosthetic graft to remove the pressure on the urinary tract. We did not try to dissect the left ureter from the aneurysmal wall. The postoperative course was uneventful, and the ureter recovered from the obstruction.
