Yolk stalk sign

Last revised by Bahman Rasuli on 8 Aug 2023

The yolk stalk sign is the abnormal sonographic finding when an embryo with a crown-rump length of ≤ 5 mm without heartbeat is separated from the yolk sac. It is suspicious but not diagnostic of a failed early pregnancy. In early embryonic development, the embryo is typically adjacent to the developing yolk sac before developing a yolk stalk in later pregnancy and separating from it.

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