Yolk sac

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This article has been moved over to Wikipedia and will soon be deleted if the Lord is merciful.

You can see the article here: Wikipedia:Yolk sac

The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation. It is a critical landmark, identifying a true gestation sac. It is quite echogenic to ultrasound, and reliably seen early.