ABSTRACTIn a normal pregnancy, the extra embryonic coelom (EEC) may persist until 16 or 17 weeks gestation and is able to be visualized ultrasonically. In static echograms the amnion and EEC may mimic the features of threatened abortion or other conditions such as the empty sac of a second twin or an amniotic band. When the appearance is due to persistence of the EEC, real‐time evaluation of the membranes reveals an easily recognizable “floppy” movement of the amnion, whereas two other different patterns of movement are seen in threatened abortion and when an empty gestation sac is present in association with an intact pregnancy. Four illustrative case reports are presented. It is important that these different types of movement are able to be recognized because it permits differentiation between physiological and pathological conditions and improves diagnostic accuracy.
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