A 70-year-old man presents with severe, postprandial, mid-abdominal pain which has become more severe over the past 6 to 9 months. It is associated with nausea but has not caused him to vomit or changed his bowel habits. He has lost 14 kg over the last 6 months. Abdominal and rectal examination is normal. Upper gastrointestinal series is unremarkable. Which one of the following is the most likely diagnosis?
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