Lesson 9:12:12.

Source; medscape.

Pregnancy diagnosis. The arrow is pointing to the yolk sac as seen within the gestational sac (GS). The yolk sac is usually identified before the GS is larger than 10 mm. Likewise, if the yolk sac is larger than 7 mm without signs of a developing fetal pole, the chance of an abnormal pregnancy is increased.

Pregnancy diagnosis. This is a gestational sac (GS) that measures approximately 2 X 3 cm, without evidence of a yolk sac. When the GS is larger than 10 mm and no yolk sac is identified, an abnormal pregnancy is likely. This particular situation is referred to as a blighted ovum or an anembryonic pregnancy.

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