At what size of mean gestational sac diameter measured on TVS with no embryonic pole is labelled as ‘Anembryonic Gestation’ –
Correct Answer: 25mm
Description: An intrauterine gestational sac is reliably visualized with transvaginalsonography by 5 weeks, and an embryo with cardiac activity by 6 weeks The embryo should be visible transvaginally once the mean sac diameter hasreached 25 mm--otherwise the gestation is anembryonic. Cardiac motion isusually visible with transvaginal imaging when the embryo length reaches 5 mm.
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Gynaecology & Obstetrics
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