Definition of Bilateral hydronephrosis:

Bilateral hydronephrosis is the enlargement (distention) of the pelvis and urine collecting structures of both kidneys. Bilateral means both sides.

See also: Unilateral hydronephrosis

Causes, incidence, and risk factors:

Bilateral hydronephrosis oocurs when urine is unable to drain from the kidney down the ureters into the bladder. Hydronephrosis is not itself a disease, but rather a physical result of whatever disease is keeping urine from draining out of the kidneys, ureters, and bladder.

Disorders associated with bilateral hydronephrosis include:

• Acute bilateral obstructive uropathy
• Chronic bilateral obstructive uropathy
• Vesicoureteric reflux
• Uteropelvic junction obstruction
• Posterior ureteral valves
• Neurogenic bladder
• Bladder outlet obstruction
• Prune belly syndrome