FIG. 7. Normal histology of the Meckel's diverticula, with small foci of carcinoid tumour. Normal mucosa (M) and normal submucosa (S), separated by muscularis mucosa (MM). Several small foci (< 0.2 cm each) of carcinoid tumour (C) are identified at the interface of the lamina propria and sub mucosa. The tumour does not invade the luminal surface or extend into the muscularis propria.