1 MCQs in Medicine for NEET PG
A 58-year-old man presents with a 6-month history of intermittent dysphagia to solids, particularly meat and bread, with no difficulty swallowing liquids. He denies weight loss. Upper endoscopy reveals a thin, symmetric, circumferential mucosal narrowing at the gastroesophageal junction (marked **D** in the diagram). Biopsies from the mid and distal esophagus show normal histology. Which of the following best describes the pathophysiology of the structure marked **D**?
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