Microscopic evaluation of the non-dilated intestinal segment. Sections from the non-dilated segment showing normal architecture consisting of inner circular (IC) and outer longitudinal (L) smooth muscle layers. Ganglia and nerves (stars) as well as interstitial cells of Cajal (arrows) are non-remarkable. (a) Hematoxylin and eosin (H&E), (b) Masson trichrome, (c) S-100, and (d) CD117 (c-kit). (a-c) Original magnification × 10. (d) Original magnification × 40.