Gross pathologic findings of the terminal ileum, the ileo-cecal valve and the cecum (from right to left). The terminal ileum shows acute ulcers with elevated ulcer rim and irregular base. The mucosa of the ileo-cecal valve and the cecum shows a confluent ulcer with an elevated border. The submucosa is markedly edematous. The vermiform appendix (↑) is mildly congested.