A 68-year-old woman presents with progressive dyspnea and fatigue. Investigations reveal iron-deficiency anaemia (Hb 7.2 g/dL, ferritin 8 ng/mL). Upper GI endoscopy shows a large hiatal hernia. On careful retroflexed inspection at the level of the diaphragmatic hiatus, the endoscopist identifies the lesions marked **A** in the diagram — linear erosions running parallel to the gastric folds on the mucosal crest. What is the most likely pathophysiological mechanism underlying these lesions?
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