Editing CUA: Antenatal hydronephrosis (2017) (section)

== Differential Diagnoses ==
*'''<span style="color:#ff0000">Differential diagnosis of antenatal hydronephrosis, in order of likelihood, includes:'''
*# '''<span style="color:#ff0000">Transient primary hydronephrosis'''
*# '''<span style="color:#ff0000">Uretero-pelvic junction obstruction (UPJO)'''
*# '''<span style="color:#ff0000">Vesicoureteric reflux (VUR)'''
*# '''<span style="color:#ff0000">Uretero-vesical junction obstruction (UVJO)'''
*# '''<span style="color:#ff0000">Primary non-obstructive megaureter'''
*# '''<span style="color:#ff0000">Ureterocele'''
*# '''<span style="color:#ff0000">Ectopic ureter'''
*# '''<span style="color:#ff0000">Megacystis (dilated urinary bladder)'''
*#'''<span style="color:#ff0000">Bladder outlet obstruction due to posterior urethral valves (PUV)''' 
*Less common diagnoses include
** Prune Belly syndrome
**Megacystis-megaureter syndrome
**Megacystis-microcolon intestinal hypoperistalsis syndrome
**Anterior urethral valves
**Megalourethra
**Urethral atresia
**Cloacal anomalies

=== Megacystis ===

* '''The dilated fetal bladder or megacystis has been defined based on the formula for fetal bladder sagittal length in mm = gestational age in weeks + 2'''