Citation, DOI and case data
First trimester bleeding. Gestational age by LMP 13 weeks + 5 days
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A single living fetus with normal heartbeats (148 b/min).
A large hypoechoic crescent-shaped fluid collection with internal septations is seen extending between the uterine wall and the chorionic membrane posteriorly reaching the placental margins and crossing the internal os, coping with subacute/chronic subchorionic hemorrhage.