When the superior mesenteric vein is located to left of the superior mesenteric artery, the malrotation should be diagnosed and be suspect when the vein is in front of artery.

• 结论超声探测肠系膜上血管的位置及关系对诊断肠旋转不良有重要价值,如果发现肠系膜上静脉位于肠系膜上动脉左侧,可诊断肠旋转不良,位于前方者应怀疑本症。