This multi-image medical exhibit shows the development and progression of an invasive cancerous tumor of the cecum of the large bowel. .Specifically shown are the following: 1. Normal cecum and layers of the bowel as describe in the Duke's tumor classification, 2. Progressive cut-sections through the bowel wall illustrating the tumor's growth from the mucosa, to the submucosa and finally through to the muscular and outer layers of the colon.