Question

What instrument is used to insert this tube? 

• A. Nephroscope
• B. Cysto-urethroscope
• C. Ureteroscope
• D. Endoscope

Hint:

For placing a nephrostomy tube, a cysto-urethroscope is the appropriate instrument as it allows visualization of the bladder, ureters, and renal pelvis.

Answer 1

The Correct Option is B

Answer: Cysto-urethroscope.

Pick the instrument by the route it must take to reach the tube's final place. A tube or stent that ends in the bladder has to travel up the urethra first, so the scope used must be able to see inside both the urethra and the bladder.

The cysto-urethroscope does exactly that. ("Cysto" means bladder and "urethro" means urethra.) It passes through the urethra, lets the surgeon see the bladder, and lets a catheter or stent be placed, which matches the picture.

The other instruments reach different places:
- Nephroscope passes straight into the kidney through the skin of the back, used in kidney stone surgery.
- Ureteroscope is a thin, long scope pushed up into the ureter, the tube between kidney and bladder.
- Endoscope is only a general word for a viewing scope, too vague to be the answer.

Because the tube is placed into the bladder through the urethra, the correct instrument is the cysto-urethroscope (option 2).