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Some authors claim that any point not on the frontier cannot be best.What is their reasoning to support this?
Retrograde Pyelography
A radiologic procedure in which the doctor injects a contrast medium through a urethral catheter and takes a series of X-rays to evaluate the function of the ureters, bladder, and urethra.
Contrast Medium
A substance used in medical imaging to improve the visibility of internal body structures.
Urethral Catheter
A flexible tube inserted through the urethra into the bladder to drain urine.
Cardiovascular Angiography
A medical imaging technique used to visualize the inside of blood vessels and organs of the heart, employing a special dye and X-rays to detect blockages or abnormalities.
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