In percutaneous lithotripsy, the ultrasonic probe is inserted through which structure into the renal pelvis?

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Multiple Choice

In percutaneous lithotripsy, the ultrasonic probe is inserted through which structure into the renal pelvis?

Explanation:
Percutaneous lithotripsy relies on gaining direct access to the kidney through the skin. A tract is made from the skin into a renal calyx and pelvis, commonly maintained with a nephrostomy tube. The ultrasonic probe is then passed through this nephrostomy tract into the renal pelvis to fragment the stones. Access via the ureter would require a retrograde route up from the bladder (ureteroscopy), which is not how this percutaneous approach works. The bladder itself is distal from the kidney, and a general catheter does not provide the specialized pathway into the renal collecting system used in this procedure.

Percutaneous lithotripsy relies on gaining direct access to the kidney through the skin. A tract is made from the skin into a renal calyx and pelvis, commonly maintained with a nephrostomy tube. The ultrasonic probe is then passed through this nephrostomy tract into the renal pelvis to fragment the stones. Access via the ureter would require a retrograde route up from the bladder (ureteroscopy), which is not how this percutaneous approach works. The bladder itself is distal from the kidney, and a general catheter does not provide the specialized pathway into the renal collecting system used in this procedure.

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