Obstructive nephropathy.

In summary, obstructive nephropathy accounts for 2 to 10 percent of acute renal failure. Clinical signs, such as anuria with a rising serum creatinine, with or without low back pain, may suggest the diagnosis. Ultrasound is a good screening test, but pyelography may be required to make the diagnosis. Treatment is primarily aimed at relieving the obstruction and managing the post-obstructive diuresis. If found early, even patients with complete obstruction, once relieved, experience a complete return of renal function.