Traumatic renal artery dissection identified with dynamic helical computed tomography.

Intimal tears in the renal arteries typically result from traumatic mechanisms that produce rapid deceleration. These injuries usually progress to secondary thrombosis of the vessel. When the tear leads to dissection with luminal stenosis, early diagnosis and repair will preserve parenchymal function. Computed tomography has replaced intravenous pyelography as the radiographic study of choice for renal trauma. We present two patients with unilateral delay of renal contrast enhancement during dynamic helical computed tomography scan due to arterial stenosis from intimal dissection confirmed with arteriography. Both vessel injuries were successfully managed with endovascular stent placement. No previous description of this diagnostic strategy is reported in the literature.