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The intradecidual sign denotes the appearance of the small gestational sac in the uterine cavity surrounded by the thickened, echogenic endometrium.
The intradecidual sign can be misdiagnosed, as it may resemble the pseudogestational sac of an ectopic pregnancy.
To differentiate an intrauterine gestational sac from the pseudogestational sac, sonographers can assess the endometrium for evidence of the double sac sign or
double decidual sign.
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