Most common predisposing factor for chronic pyelonephritis is:: (A) Diabetes mellitus, (B) Renal stone, (C) Posterior urethral valve, (D) Vesicoureteric reflux
Answer is D. Chronic pyelonephritis is so often associated with vesicoureteric reflux that some feel that it is better named "Reflux nephropathy". It is impoant cause of renal damage and death from end - stage renal failure.