Editing Management of Upper Urinary Tract Obstruction (section)

==== Imaging ====
* Performed to determine the anatomic site and functional significance of an apparent obstruction
* '''Diuretic renography'''
**'''Commonly used''' for diagnosing both UPJ and ureteral obstruction
**'''<span style="color:#ff0000">Most commonly used agent in renogram studies is technetium 99m mercaptoacetyltriglycine (99m Tc-MAG3), especially in the pediatric population[https://www.ncbi.nlm.nih.gov/books/NBK560740/ §]'''
***In the adult population, other agents can be used, such as diethylenetriamine pentaacetate (DTPA)
**'''<span style="color:#ff0000">Provides quantitative data regarding differential renal function and obstruction</span>''', even in hydronephrotic renal units '''(see Pathophysiology of UUT Obstruction Chapter Notes for nuclear imaging details)'''
*** '''<span style="color:#ff0000">In general, kidneys with < 15% differential function are nonsalvageable in adults</span>''' (Chapter 48 suggests <10%)'''.'''
**** '''If the potential for salvageability of function is still unclear, an internal stent or percutaneous nephrostomy may be placed for temporary relief of obstruction and renal function studies subsequently repeated'''