Follow-up voiding cystourethrography (VCUG) is usually performed >3 months after treatment for vesicoureteral reflux (VUR) in children, but a recent study set out to establish whether a 24-h VCUG would be just as reliable. Of 40 patients (56 ureters) with VUR who underwent first injection of dextranomer/hyaluronic acid, only two ureters with grade IV and one patient with grade V VUR showed failure on 24-h VCUG. However, the success rates on 6-month VCUG were 100%, 83.3%, 78.57%, 50%, and 42.85% according to ascending order of VUR grade, suggesting that the 24-h VCUG is unreliable.