Appendiceal Crohn’s disease clinically presenting as acute appendicitis

Figure 1 Appendiceal Crohn’s disease. A: The appendix with Crohn’s disease shows transmural inflammation with markedly thickened wall; B: There is a prominent lymphoid hyperplasia in the mucosa and serosa; C: The mucosa shows many small non-caseating granulomas; D: The serosa shows creeping fat with perpendicular thick fibrous bands.