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MediumGastroenterologyAchalasiaukmlamrcgp aktpanemrcp part 1

A 55-year-old woman presents with intermittent dysphagia, chest pain (non-cardiac type), and regurgitation of undigested food, sometimes waking her at night. A barium swallow shows a dilated oesophagus tapering to a 'bird's beak' appearance at the gastro-oesophageal junction. What is the most likely diagnosis?

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