Specific CT Enteroclysis findings with or without other clinical and laboratory variables, can identify Crohn's disease patients who will response to medical therapy versus those who will either fail and require surgery or have uncontrolled disease.

Inclusion Criteria:

• Crohn's disease with CT Enteroclysis during symptomatic treatment

Exclusion Criteria:

• Crohn's disease subjects who have had a follow-up less than 1 year, without surgery
• Crohn's disease subjects that were later diagnosed with a bowel malignancy

Crohn's disease patients that have had a CT Enteroclysis as part of their clinical evaluation for symptomatic Crohn's disease will be eligible. Subjects who were later diagnosied with bowel malignancy and subjects with a period of follow-up of less than 1 year(without surgery) will be excluded.