A micturating cystourethrogram is a procedure allowing the urethra to be x-rayed using contrast dye passing from the bladder through the urethra./A pediatric voiding cystourethrogram (VCUG) is an x-ray examination of a childs bladder and urinary tract that uses a special form of x-ray called fluoroscopy and a contrast material. An x-ray exam helps doctors diagnose and treat medical conditions.