Key Clinical Message
This is the first reported case of descent of the placental marginal sinus through the cervix to the external os. We think marginal sinus rupture does exist. The definition of placental edge should be the parenchyma in diagnosis of low‐lying placentation. Clinically, however, the low‐lying marginal sinus should be treated similar to low‐lying placentation.
The risk of placenta accreta spectrum disorder was high when intraplacental blood flow continued 15 minutes after childbirth following a cesarean delivery.
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