During retrograde urography, how is the contrast media administered?

In retrograde urography, the contrast media is administered directly into the urinary system through a ureter catheter. This procedure involves the placement of a catheter into the ureter, which allows for the introduction of the contrast material to visualize the urinary tract, specifically the kidneys, ureters, and bladder.

This technique is useful in situations where traditional intravenous urography may not provide adequate visualization, such as when there is a blockage or obstruction in the urinary tract. By directly instilling contrast media into the ureters, it ensures a more localized and detailed assessment of the anatomy and function of the urinary system, making this method particularly effective for diagnostic purposes.

Oral, intravenous, and rectal administration techniques do not provide the direct visualization necessary for retrograde urography, which is why they are not suitable methods for this particular imaging procedure.