Editing CUA: Antenatal hydronephrosis (2017) (section)

===== Technique =====

*'''Steps by step'''
*# '''A scout view''' for assessment of spine anomalies, presence of significant constipation or urinary stones
*# '''Catheter is inserted'''
*#* '''A balloon catheter should not be used''', as the balloon can obscure the filling defect characteristic of a ureterocele.
*#* The amount of urine removed should be recorded and the urine sent for analysis and culture as indicated.
*#* The bladder should be gravity filled until the first void occurs, with recording of the bladder capacity.
*# '''Voiding views''' of the urethra with post-void views of the bladder.
*# '''Delayed imaging''' after the post-void image may be required if there is VUR into a dilated renal pelvis or ureter so as to assess for concomitant UPJO and UVJO
** '''A cyclical study with at least two fill and void cycles will increase the detection of VUR.'''
**#