1 MCQs in Medicine for NEET PG
A 58-year-old man with a 12-year history of heartburn undergoes upper endoscopy for Barrett esophagus surveillance. The endoscopist identifies the structure marked **A** in the diagram—a salmon-pink to red-orange columnar mucosa extending 4 cm above the gastroesophageal junction, sharply demarcated from the normal pale squamous mucosa above. Biopsies confirm specialized intestinal metaplasia with goblet cells. Which of the following best describes the pathophysiologic basis of the appearance and histology of the structure marked **A**?
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