Retrograde Pyelogram involves:

Retrograde Pyelogram involves:

• A. Oral contrast media is used to visualize the renal collecting system
• B. Contrast media is injected via a ureteral catheter inserted through a cystoscope
• C. Contrast media is injected into the renal artery
• D. Contrast media is inhaled as a gas for imaging

Answer: (B)

Retrograde pyelography visualizes the urinary collecting system by injecting contrast media directly into the ureter from below. A cystoscope is used to access the ureteral orifice, a ureteral catheter is threaded into the ureter, and contrast is injected retrograde (against the normal flow of urine) up into the renal pelvis and ureter for radiographic imaging. This direct, bottom-up injection is what distinguishes retrograde pyelography from other studies. Oral contrast is used for GI imaging, contrast into the renal artery is angiography, and inhaled gas is not used for this procedure, so those options don’t describe retrograde pyelography.

Retrograde pyelography visualizes the urinary collecting system by injecting contrast media directly into the ureter from below. A cystoscope is used to access the ureteral orifice, a ureteral catheter is threaded into the ureter, and contrast is injected retrograde (against the normal flow of urine) up into the renal pelvis and ureter for radiographic imaging. This direct, bottom-up injection is what distinguishes retrograde pyelography from other studies.

Oral contrast is used for GI imaging, contrast into the renal artery is angiography, and inhaled gas is not used for this procedure, so those options don’t describe retrograde pyelography.