An 8-year-old boy presents with painless rectal bleeding and dark maroon stools for three days. He is tachycardic (HR 128/min), hypotensive (BP 95/60 mmHg), and pale. Upper endoscopy and colonoscopy are unremarkable. Technetium-99M pertechnetate scintigraphy (Meckel scan) after pentagastrin and cimetidine pretreatment shows focal increased radiotracer uptake in the right lower quadrant appearing simultaneously with gastric mucosal uptake, persisting and intensifying over time. CT enterography confirms a blind-ending tubular outpouching from the antimesenteric border of the ileum 60 cm proximal to the ileocecal valve. The structure marked **A** in the diagram represents this scintigraphic finding. Which of the following best explains the mechanism of bleeding in this patient?
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