Figure 1: H and E photomicrograph of oriented ileal mucosa ((a) ×40) with paneth cells ((b) ×100) peyer's patches and M cells (arrows) ((c) ×40 and (d) ×100). Chromogranin stain shows enteroendocrine cells ((e) ×100). Features of acute ileitis: inflammed edematous villi ((f) ×40) crypt abscesses, muco-depletion (arrow) ((g) ×100) ulceration ((h) ×40) flattened epithelium ((i) ×100) and maintained test tube rack appearance of crypts ((j) ×40). Features of chronic ileitis: distorted crypt architecture with branching ((k) ×40; (l) ×100) loss of mucosal crypts ((m) ×40) pyloric metaplasia ((n) ×40) and hypercrinia (arrows) ((o) ×40)