PMC2990240_01
(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).
PRI2010-614280.001.jpg
PMC2990240_01_PRI2010-614280.001.jpg
fig1
There was no evidence of an ulcer or other mucosal defect in the pyloric channel, but the channel did not appear to relax and dilate (Figure 1(a)).