[Ureteral obstruction and hydronephrosis. A complication after aortic bypass surgery].

Ureteral obstruction is a rarely reported complication of reconstructive surgery on the aorta. It is often an asymptomatic condition seen several years after the initial operation. The true incidence is unknown, but is estimated to 1%. As delayed hydronephrosis appears to be a marker of present graft complications, the patients should be closely evaluated. Two cases of ureteral obstruction are described and the management of this complication is discussed.