<prompt> Stipple sign in transitional cell carcinoma of the renal collecting system is best demonstrated byIntravenous urographyRetrograde pyeloureterographyRadionuclide scanUltrasound scan  <response>: An intravenous pyelogram, also called an intravenous urogram, is a radiological procedure used to visualize abnormalities of the urinary system, including the kidneys, ureters, and bladder. 