Quote from "ESPES Manual of Pediatric Minimally Invasive Surgery" by Ciro Esposito, François Becmeur, Henri Steyaert, Philipp Szavay -
"A small, contracted bladder in infancy that progresses to a large capacity, poorly compliant bladder, often found in the presence of persistent upper tract dilatation and nephrogenic diabetes insipidus, has been termed valve bladder. This can create a self-injurious cycle, with persistent dilatation leading to a renal concentrating defect and creating more work for bladder at risk of muscular failure. Regular urodynamic monitoring is crucial in the management of these patients."