Although the clinical course and prognosis of acute poststreptococcalglomerulonephritis(APSGN)isgenerallygood,especially in children, the natural history ofAPSGN in patients with urinary tract abnormality, such as hydronephrosis or vesicoureteral reflux (VUR), is unclear. The term megaureter-megacystis syndrome was first used in 1954 byWilliams to describe a group of children who had a large capacity, smooth, thin-walled bladder and massive VUR. 1 It has been shown that the cause of upper tract dilatation and enlarged bladder is the constant recycling of massive amounts of refluxed urine. 2