X-ray imaging of the urinary tract after injection of contrast material; pyelography.

• A. Intravenous pyelogram
• B. Cystography
• C. Retrograde pyelography
• D. Urography

Answer: (D)

Urography is the radiographic study of the urinary tract after administration of contrast material. It provides visualization of the kidneys, ureters, and bladder as the contrast is excreted, capturing the entire excretory pathway. The phrase describes this broad imaging approach, which encompasses any method that uses contrast to outline the urinary tract.

An intravenous pyelogram is a specific type of urography where contrast is given intravenously to visualize the collecting system, but urography as a whole covers imaging of the entire tract. Cystography focuses on the bladder alone, and retrograde pyelography involves directly injecting contrast into the ureters via the bladder with a scope, which is a more targeted procedure. Thus, the broad term that fits the description is urography.