From the case:
Yolk sac
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5 weeks and 5 days early pregnancy with yolk sac and fetal pole.
Case Discussion
The yolk sac is the first anatomical structure identified within the gestational sac. It plays a critical role in embryonal development by providing nutrients, serving as the site of initial hematopoiesis, and contributing to the development of fetal gastrointestinal and reproductive systems.
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