From the case: Sigmoid volvulus with subsequent therapeutic barium enema
Therapeutic barium enema
This fluoroscopy series depicts the first 15 seconds after the catheter is opened and pressure in the sigmoid is relieved. Scroll through the series from top to bottom. You will see how the distension of the up-until-then closed off sigmoid promptly decreases. Note how the catheter runs in a loop, as it passes through the twisted sigmoid lumen.