Computed tomographic enterography adds value to colonoscopy in differentiating Crohn's disease from intestinal...

Area of Science:

• Gastroenterology
• Radiology
• Infectious Diseases

Background:

• Crohn's disease and intestinal tuberculosis (ITB) present similar symptoms, making differential diagnosis challenging.
• Computed tomographic enterography (CTE) shows promise for evaluating small bowel diseases, but its utility in distinguishing Crohn's from ITB is not well-defined.

Observation:

• A prospective study compared CTE and colonoscopy findings in 105 patients with Crohn's disease (n=67) and ITB (n=38).
• CTE features like proximal small-bowel involvement, asymmetrical mural thickening, segmental lesions, mural stratification, comb sign, and mesenteric fibrofatty proliferation were more frequent in Crohn's disease.
• Mesenteric lymph node changes (calcification, central necrosis) and focal ileocecal lesions were more common in ITB.

Findings:

• Multivariate analysis identified segmental small-bowel involvement and the comb sign as independent predictors of Crohn's disease.
• Combining CTE and colonoscopy findings increased diagnostic accuracy from 66.7% to 95.2% in the development set.
• The validation dataset showed a sensitivity of 92.5%, specificity of 80%, and an area under the ROC curve of 0.862 for the combined approach.

Implications:

• CTE provides valuable information that enhances colonoscopy for differentiating Crohn's disease from ITB.
• The developed diagnostic algorithm significantly improves diagnostic accuracy, aiding in appropriate patient management.