Contrast study: Barium enema
A large, lobulated mass fills the lumen of the sigmoid colon. Overlying mild mucosal irregularity present with narrowing of the distal segment of the colon. No stricture or obstruction is seen.
Villous adenoma with carcinoma of colon
The barium enema, particularly with a double-contrast technique, is valuable in detecting colon polyps as well as colon cancer. Intraluminal polyps are more easily detected than those that are sessile (along with the colon wall).
Evolution of polyps into colon cancer does occur; the
larger the polyp, the greater the chance the histology will
show a malignant change.