Quick summary
The barium enema evaluates colonic morphology and mucosal detail. Single contrast (barium alone) provides gross anatomy and is preferred for obstruction evaluation; double contrast (barium + air) provides superior mucosal detail for polyps and early mucosal lesions. Largely replaced by CT colonography and colonoscopy but still used for obstruction characterization, pediatric Hirschsprung's disease, and post-surgical evaluation.
Indications
- Colonic obstruction — site, level, and etiology
- Suspected colonic volvulus (sigmoid, cecal)
- Hirschsprung's disease (pediatric — single contrast, no prep)
- Post-surgical evaluation (anastomotic leak, stricture)
- Diverticular disease characterization
- Reduction of sigmoid volvulus (water-soluble enema)
Normal Colonic Anatomy and Landmarks
| Segment |
Normal Appearance |
| Rectum |
Smooth walls; no haustra; anterior impression from prostate/uterus |
| Sigmoid |
Redundant; haustra present; mobile |
| Descending colon |
Retroperitoneal; fixed; uniform haustral pattern |
| Splenic flexure |
Acute angle; fixed; leftmost point of colon |
| Transverse colon |
Mobile; dependent; uniform haustra |
| Hepatic flexure |
Acute angle; right upper quadrant |
| Ascending colon |
Retroperitoneal; fixed |
| Cecum |
Most distensible segment; largest caliber; no haustra |
| Appendix |
Fills in ~50% of cases; normal = smooth, fills, empties |
| Haustra |
Normal sacculations; do NOT cross the entire lumen (vs. valvulae conniventes of small bowel) |
Key Findings — Neoplastic
| Finding |
Features |
| Apple core lesion |
Circumferential annular carcinoma; overhanging edges ("shouldering"); irregular mucosal destruction; abrupt transition to normal colon — classic for adenocarcinoma |
| Polypoid lesion |
Sessile or pedunculated filling defect; smooth (adenoma) vs. irregular (carcinoma); measure size; pedunculated = stalk visible |
| Carpet lesion |
Flat, villous adenoma; subtle mucosal irregularity without discrete polyp; most common in rectum and cecum; high malignancy rate |
Any apple core lesion on barium enema must be communicated as a likely carcinoma. Colonoscopy with biopsy is required. Do not understate the finding — this is a CRITICAL result that requires direct physician communication.
Key Findings — Inflammatory Bowel Disease
| Feature |
Ulcerative Colitis |
Crohn's Colitis |
| Distribution |
Continuous from rectum proximally |
Skip lesions; rectum often spared |
| Rectal involvement |
Always |
Often spared |
| Haustra |
Lost ("lead pipe colon" in chronic disease) |
Preserved or asymmetrically involved |
| Ulcers |
Collar button ulcers (flask-shaped); diffuse |
Longitudinal ulcers; rose-thorn pattern; cobblestone |
| Fistulas |
Rare |
Common (internal and external) |
| Terminal ileum |
Backwash ileitis (late, mild) |
Involved in 80% (string sign, cobblestone) |
Key Findings — Diverticular Disease
| Finding |
Description |
| Diverticulosis |
Flask-shaped outpouchings beyond bowel wall; most common in sigmoid; necks project through muscularis |
| Diverticulitis |
Cannot diagnose active diverticulitis with barium — CT is required. Barium enema may show extrinsic mass effect, spasm, or fistula from prior episodes |
| Pericolic fistula |
Colovesical, colovaginal — contrast fills fistulous tract; barium enema demonstrates better than CT for fistula lumen |
Hirschsprung's Disease (Pediatric)
Never perform bowel prep before a Hirschsprung's barium enema — retained stool is a normal finding; prep washes out the diagnostic transition zone and may cause toxic megacolon in an aganglionic colon.
| Finding |
Description |
| Transition zone |
Abrupt change from normal caliber colon to narrow aganglionic segment; funnel-shaped transition; most common at rectosigmoid junction |
| Narrow aganglionic segment |
Rectosigmoid most common; total colonic aganglionosis rare |
| Delayed evacuation |
Retention of barium at 24-hour delayed film — abnormal; barium should evacuate. This is the most sensitive sign when the transition zone is subtle |
| Irregular mucosa |
Saw-tooth mucosal irregularity in the narrowed segment |
24-hour delayed film is mandatory in pediatric barium enema for Hirschsprung's. Barium retention in a non-prepped colon at 24 hours is abnormal and highly suggestive of Hirschsprung's disease even when the transition zone is equivocal.
Reporting Checklist
Common Pitfalls
| Pitfall |
How to Avoid |
| Stool mimicking polyp |
Stool is mobile — change position; compression; does not have stalk or remain fixed |
| Sigmoid redundancy hiding lesion |
Overlap is the main technical limitation of barium enema; multiple oblique positions and compression views required for sigmoid |
| Transition zone in Hirschsprung's missed after bowel prep |
Never prep pediatric Hirschsprung's study; if inadvertently prepped, study may be unreliable — consider repeating |
| Cecal filling failure |
Cecum may not fill due to ileocecal valve competence; turn patient; Trendelenburg; fluoroscopically guide contrast |
| Confusing flexure with lesion |
Acute angle of splenic or hepatic flexure en face can simulate an apple core; multiple projections resolve the overlap |
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