The reentery of the small bowel does not occur in a normal fashion and the mesentery does not fix normally to the posterior wall (3).In this situation neither atresia nor gut malrotation are found.

• 小肠的重入成型不正常，肠系膜也没有正常的固定到后壁，在这种情况下既没有发现闭锁，也没有中肠旋转不良。