however , since moderate reduction of the renal parenchyma is often observed in patients with large reflux-ureter but without a history of urinary tract infection , it is concluded that a large reflux may cause back pressure injury on the kidney during infancy but , in children more than one year old , will cause renal growth retardation and renal scarring only be predisposing to pyelonephritis .
C0022646
renal
C0034186
pyelonephritis