Pneumocolonography is a rapid, safe, and relatively easy procedure that can be performed to identify the position of the colon when it cannot be determined on survey radiographs. Usually the colon is filled with feces and gas, which makes its position apparent. If, however, the colon is poorly visualized or confusing fluid or gas opacities are present, the colon can be easily localized by creation of pneumocolon.5
In cases of suspected FBs, this technique can be helpful to differentiate dilated small intestinal loops from colon or determine whether mottled mineralized material is in the colon or small intestinal tract. After initial survey radiographs are taken (Figures 6A and 6B), the animal is placed in lateral recumbency. Air is instilled into the rectum and colon using a large lubricated syringe or rubber catheter; approximately 10 to 12 mL/kg of air is needed for moderate distention of the colon.6,7 Standard lateral and ventrodorsal radiographs are then taken (Figures 6C and 6D). In most animals, it is desirable to fill the colon to the cecum. Partial filling of the distal jejunum and ileum may occur and is normal.