Interventional colorectal endoscopic procedures: residual lesions on follow-up double-contrast barium enema study.

Endoscopic procedures such as deep rectal biopsy, sclerosant injection, or banding of hemorrhoids, and the electrocoagulation of small polyps leave residual abnormalities that will be apparent on double-contrast barium enema examinations performed a short time thereafter. Nine cases are described to illustrate the findings that may be encountered. Their recognition is important to prevent diagnostic confusion, and endoscopists should inform radiologists of any procedure performed.