Retrograde pyelography

Pyelogram (or pyelography or urography) is a form of imaging of the renal pelvis and ureter.Types include: Intravenous pyelogram – In which a contrast solution is introduced through a vein into the circulatory system. Retrograde pyelogram – Any pyelogram in which contrast medium is introduced from the lower urinary tract and flows toward the kidney (i.e. [Source: Wikipedia ]