Presentation
First trimester bleeding. Gestational age by LMP is 12 weeks.
Patient Data
Age: 20 years
Gender: Female
From the case:
Subchorionic hemorrhage
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Gravid uterus with single living fetus of about 12 weeks gestation having normal heart beats (160 b/min).
A well defined crescent-shaped hypoechoic fluid collection is seen extending between the posterior uterine wall and the chorionic membrane, crossing the internal os and reaching the lower placental margin ... Consistent with chronic subchorionic hemorrhage.
Case Discussion
Subchorionic hemorrhage occurs when there is perigestational hemorrhage and blood collects between the uterine wall and the chorionic membrane in pregnancy. It is a frequent cause of first and second trimester bleeding.
General imaging differential considerations include:
- retroplacental hemorrhage
- marginal subchorionic hematoma can mimic a twin gestational sac (particularly failed early twin gestational sac)
- chorioamniotic separation