DESCRIPTION A 42-year-old man presented to the Emergency Department with a sudden onset of right renal colic. Physical examination showed knocking tenderness on the rightsided costovertebral angle. Laboratory evaluation was unremarkable except haematuria on urinalysis. Abdominal radiography of the kidneys, ureters, and bladder (KUB) was negative. Intravenous urography, using 50 ml of 76% amidot...
