Yolk sac

What does "Yolk sac" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

A yolk sac is a part of a developing baby in the early stages of pregnancy. It's the first structure to form that can be seen on an ultrasound. The yolk sac provides nourishment to the baby before the placenta is fully formed. It also helps with the production of the baby's blood cells.

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