Risk stratification for pregnancies with subamniotic/subchorionic hematoma by placental MRI

Motivation: The clinical significance of subamniotic/subchorionic hematoma (SAH/SCH) is arguable; however, it can result in unfavorable outcomes for neonates. Goal(s): Our goal was to explore useful methods of risk stratification in pregnancies with SAH/SCH, based on placental MRI. Approach: Cases of SAH/SCH were classified according to the presence/absence of oligohydramnios and bloody amniotic fluid, and statistically analyzed for weeks at birth, periods in the neonatal intensive care unit (NICU), and respiratory management. Results: SAH/SCH with oligohydramnios and bloody amniotic fluid increased the risk of preterm delivery and unfavorable neonatal outcomes. In particular, oligohydramnios increases the risk of preterm delivery. Impact: When interpreting cases of SAH/SCH, particular attention should be paid to the presence of oligohydramnios, while it is important to avoid excessively negative prognostic assessments in cases with only bloody amniotic fluid.