(Robert Whitaker, 20th century, English urologist), percutaneous insertion of a canula into the renal pelvis with perfusion of contrast at a rate of 10 ml/minute and simultaneous recording of pressure in the renal pelvis and bladder to identify the presence of obstruction in doubtful cases. In children, the examination is performed under general anaesthetic and instead of a canula two fine needles are inserted. The infusion of contrast allows a simultaneous antegrade pyelography.....
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