Pyelogram

• Intravenous pyelogram – In which a contrast solution is introduced through a vein into the circulatory system. This is a form of anterograde pyelogram.
• Retrograde pyelogram – Any pyelogram in which contrast medium is introduced from the lower urinary tract and flows toward the kidney.
• Anterograde pyelogram – Any pyelogram where a contrast medium passes from the kidneys toward the bladder, mimicking the normal flow of urine.
• Gas pyelogram – A pyelogram that uses a gaseous rather than liquid contrast medium.