CAMRT Radiography Practice Exam

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Where should the catheter tip be positioned for a percutaneous nephrostogram?

Ureter
Renal pelvis
Bladder
Proximal urethra

The correct answer is: Renal pelvis

The correct positioning of the catheter tip for a percutaneous nephrostogram is in the renal pelvis. This is essential because the procedure is designed to visualize the renal collecting system, and placing the catheter tip in the renal pelvis allows for optimal contrast instillation. This positioning enables the best possible imaging of the kidneys and any potential obstructions or conditions affecting the renal anatomy. In other locations like the ureter or bladder, while they are part of the urinary system, they do not provide the direct visualization needed of the renal pelvis during a nephrostogram. The proximal urethra is also not suitable, as it is distal to the kidneys and would not allow for the examination of renal structures. Thus, the renal pelvis is the targeted area for achieving clear and useful diagnostic images in this procedure.