PMC9441867_01
Exploratory laparotomy and gastrectomy. The grossly raised, blister-like lesion on the mucosal surface of the stomach can be seen on the lesser curvature of the stomach (arrow).
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F1
A small, 2 cm in diameter, round, light pink blister-like lesion was present on the mucosal surface of the stomach near the pyloric antrum, closely associated with the lesser curvature (Figure 1).
A large caliber artery (arrow) is present within the submucosa of the stomach. H&E. Bar = 1,000 mum.
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F2
Histologically, there were multiple cross and longitudinal sections of medium-caliber, tortuous muscular arteries (>1.0 mm in diameter) located in the submucosa subjacent to the grossly visible blister-like lesion (Figure 2).
The large-caliber artery (arrow) located in the submucosa of the stomach (SM) erodes through the mucosa (arrowhead). The overlying gastric mucosa is ulcerated (asterisk). H&E. Bar = 1,000 mum. An aberrant artery has evidence of rupture and intravascular thrombosis (A). H&E. Bar = 200 mum. The ulcer bed is composed of granulation tissue that is infiltrated by large numbers of lymphocytes, plasma cells, and neutrophils (B). H&E. Bar = 200 mum.
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F3
A single large-caliber artery (>0.75 mm in diameter) containing a partially occlusive thrombus extruded through the muscularis mucosae and projected through the mucosal ulcer (Figure 3). There was a focally extensive mucosal defect overlying the ectopic artery (Figure 3).