Which radiographic examination images the bladder after instillation of a contrast medium via a urethral catheter?

• A. Voiding Cystourethrogram
• B. Cystography
• C. Retrograde Pyelography
• D. Cystoscopy

Answer: (B)

Imaging the bladder after filling it with radiopaque contrast through a urethral catheter is cystography. The procedure focuses on outlining the bladder walls and detecting any contour abnormalities or leaks while the bladder is distended from the contrast. This distinguishes it from other tests: a voiding study images the bladder and urethra during urination, which is not what’s described here; retrograde pyelography targets the ureters and renal pelvis rather than the bladder itself; and cystoscopy is an internal, direct visual examination using a scope rather than radiographic imaging.