Barium - Therapeutic barium enema
These images are from the subsequent rectal enema:
Image 1 of 2 before the enema, depicting the massively distended sigmoid loop (lower abdomen).
Image 2 of 2 before the enema, depicting the massively distended sigmoid loop (upper abdomen).
The rectum has been filled with barium contrast. The rectum ends with a characteristic beak-like appearance at the promontorium, corresponding to the mesenteric swirl seen on CT. The rectal catheter has been advanced to the point of transition.
At this stage, the rectal catheter has been advanced past the point of transition to the sigmoid.
The last stack of images 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.