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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 (light) to ultrasound, and reliably seen early.

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Topics: Yolk Sac Gestation Pregnancy Identifying True Early Weeks...

Yolk sacThe 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 (light) to ultrasound, and reliably seen early.

Yolk sac tumourYolk sac tumours are members of the germ cell tumour group of ovarian neoplasms. Almost all ovarian yolk sac tumours occur in women under the age of 30. Patients usually present with sudden onset pain and a large pelvic mass. Serum alpha-fetoprotein (AFP)

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