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Tumors of the pancreatic head pushed the pancreasduodenal arterial circle to the right, that of the duodenal ampullary and of common bile duct pushed the arterial circle to the right.
胰头癌常使胰十二指肠动脉环向右移位，而十二指肠壶腹部肿瘤及胆总管下端肿瘤可将胰十二指肠动脉环向左推移。
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