614280.fig.001a
(a)
614280.fig.001b
(b)
614280.fig.001c
(c)
614280.fig.001d
(d)
Figure 1: (a) Esophagogastroscopy (EGD) of the pyloric canal showing marked narrowing and failure to relax after dilatation. (b) Full mount of the pyloric region cross section demonstrating marked thickening of the muscularis propria layer (scanning magnification). (c) High magnification showing fascicles of smooth muscles with a disorderly stratification (high power). (d) Immunhistochemical stain for smooth muscle actin antibody confirms the presence of layers of smooth muscles (high magnification).