A 50-year male with paroxysmal abdominal pain for 6 days，nausea and abdominal distension for 2 days admitted to the ER.Physical examination showed abdominal bulge and visible peristalsis.Active bowl sound and gurgling could be heard by auscultation.X-ray showed fluid level in the dilated small intestine in the middle abdomen and a small amount of gas in the colon.The most possible diagnosis is： —

单选题 编号：3688517

1.A 50-year male with paroxysmal abdominal pain for 6 days，nausea and abdominal distension for 2 days admitted to the ER.Physical examination showed abdominal bulge and visible peristalsis.Active bowl sound and gurgling could be heard by auscultation.X-ray showed fluid level in the dilated small intestine in the middle abdomen and a small amount of gas in the colon.The most possible diagnosis is：

A.Paralytic intestinal obstruction
B.Lower-level small intestinal obstruction
C.Higher-level small intestinal obstruction
D.Necrostic enteritis
E.Sigmoid volvulus

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