A. One of the following three conditions should be present:

1. Intestinal longitudinal ulcer or deformity induced by a longitudinal ulcer or cobblestone pattern

2. Intestinal small aphthous ulcerations arranged in a longitudinal fashion for at least three months, plus noncaseating granulomas

3. Multiple small aphthous ulcerations in both the upper and lower digestive tract, not necessarily with longitudinal arrangement, for at least three months, plus noncaseating granulomas

B. The following diseases should be excluded:

1. Ulcerative colitis

2. Ischemic enterocolitis

3. Acute infectious enterocolitis

 

References:

1. Yao T, Matsui T, Hiwatashi N. Crohn's disease in Japan: diagnostic criteria and epidemiology. Dis. Colon Rectum. 2000 Oct;43(10 Suppl):S85-93. [Medline]