What is the role of pyelography in the workup of hydronephrosis and hydroureter?

Updated: Dec 16, 2020
  • Author: Dennis G Lusaya, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Antegrade or retrograde pyelography is usually used to relieve, rather than diagnose, urinary tract obstruction. However, these procedures can also be performed for diagnosis when the history is highly suggestive (eg, unexplained acute kidney injury in a patient with known pelvic malignancy), even though hydronephrosis may be absent (due to possible ureteral encasement) on ultrasonography and CT scanning. [14]

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