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There is rounded, anechoic structure located eccentric to the endometrial cavity (intradecidual sign) - in keeping with an intrauterine gestational sac. The clip images (second stack) show more clearly the presence of a double decidual sign. Appearance is therefore compatible with an intrauterine gestational sac with a high level of certainty, even though no yolk sac or embryo are visible at this stage.
Mean sac diameter - 6mm.
Note the incidental presence of bilateral corpora lutea.