Fig. 4

(A) Photomicrograph of the stenotic descending colon showing complete wall layers, including the mucosa (M), submucosa (S), muscularis propria (MP), and adventitia (Ad), along with the myenteric plexuses (yellow arrows). Submucosal fibrosis (blue asterisk) was observed in the stenotic region. H&E, 40× magnification. (B) A normal distribution of the ganglion cells (green arrows) in the myenteric plexuses was observed between the inner circular (IC) and outer longitudinal (OL) layers of the stenotic descending colon. H&E, 200x magnification