In vivo trigonal measurements and their relationship to competence of the ureterovesical junction

In vivo measurements of the trigone were obtained in 73 children undergoing cystourethroscopy for evaluation of urinary tract infection with and without associated vesicoureteral reflux. These data revealed greater mobility or distensibility of the trigone in children with reflux. In addition, those children with large trigones had shorter submucosal tunnels. Bladder capacity was not statistically different between the 2 groups.