以下为句子列表：
英文: A contrast-enhanced abdominal computed tomography scan confirmed the presence of extrinsic obstruction in the third part of the duodenum caused by the superior mesenteric artery.
中文: 经腹部计算机断层检查确认第十二指肠三部分受上肠系膜动脉外在压迫而阻塞。
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英文: A transmesenteric hernia usually manifests in association with proximal small bowel dilatation, with a transition zone to a normal or collapsed intestine.
中文: 肠系膜疝通常显示为近端小肠的扩张，与正常或塌陷肠管间存在过渡区。
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英文: Because of the absence of a limiting hernial sac, mechanical SBO usually occurs in cases of transmesenteric hernia (Fig 8), and it is impossible to differentiate closed-loop obstructions caused by herniation through the mesenteric defect from those caused
中文: 由于后者没有局限性的疝囊，机械性SBO通常发生在肠系膜疝的病例中（图8），而且不能区分经肠系膜缺损疝导致的闭合性肠梗阻与粘连带下的肠脱垂导致的闭合性肠梗阻。
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英文: CT shows that the mesenteric vascular pedicle is characteristically engorged, stretched, and crowded; in addition, converging mesenteric vessels are located at the entrance of the hernial sac (34) and there is displacement of the main mesenteric trunk (9,
中文: CT表现为特征性的肠系膜血管蒂充盈、拉长和拥挤，另外，汇聚的肠系膜血管位于疝囊的入口处，肠系膜的主干发生移位。
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英文: Alterations of middle molecular substances in superior mesenteric artery occlusion(SMAO)shock
中文: SMAO休克过程中血浆中分子物质含量变化
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