How is dx of duplicity?

US normal (grade 1-2) or hydronephrotic wide ureter (grade 3-5) Voiding Cystourethrogram (VCUG) 100% diagnostic but invasive and traumatic (radio test see bladder emptying and filling by urethra Thin cath inserted into urethra to bladder, contrast dye given visible on X ray, take images as bladder fills and during voiding observes reflux (active) Urine analysis and US are enough, determine infection and inflammation nuclear scan DMSA sees obstruction indicated for febrile UTIs where scars may be developed