Editing CUA: Antenatal hydronephrosis (2017) (section)

=== Low-grade hydronephrosis (SFU Grade 1 and 2) or APD <10 mm on 3rd Trimester Ultrasound ===
* '''<span style="color:#ff0000">Initial post-natal RBUS'''
** Timing open to debate; '''<span style="color:#ff0000">most physicians will obtain an US within the first months of life and a follow-up can be obtained 6 months later.'''
*** In the absence of deterioration, follow-up US can then be performed on an annual basis.
* '''<span style="color:#ff0000">Additional investigations'''
** '''<span style="color:#ff0000">VCUG and MAG3 are not required'''
* '''<span style="color:#ff0000">CAP is unnecessary'''
* '''The majority of such cases improve by age 2'''. Since the majority of congenital UPJO progresses to pyeloplasty by 18 months of age, '''continue follow-up to at least until age 2.'''
** There is controversy on the need for follow-up beyond 2 years of age in patients who have persistent LGHN.