Giant pseudopolypoidal retrograde obstruction in ulcerative colitis.

A partially obstructing giant pseudopolyp of the left colon precluded examination of the proximal colon by sigmoidoscope and by retrograde barium enema. Four ounces of oral Gastrografin was used to opacify the colon at 24 h. It is suggested that the use of water soluble contrast media has a role to play in colon investigation in special situations.