SUMMARY
In patients with posterior urethral valves (PUV), severe unilateral vesicoureteral reflux (VUR) is one of the three conditions associated with preservation of renal function. Others are urinary ascites or urinoma in newborns and large congenital bladder diverticula. These conditions most likely provide a pop-off mechanism preventing the development of high intravesical pressure. Only 5% if patients with PUV and an associated pop-off mechanism will develop renal failure as opposed to 40% of patients with PUV without a protective factors.
Keywords: Posterior Urethral Valves, Unilateral Vesicoureteral Reflux, Hydrocalycosis..