Massive Subchorionic Placental Cyst and Poor Fetal Growth: A Case Report.

Background: Large placental cysts are unusual and rarely have significant impact on pregnancy.

Case: We present a case of a progressively enlarging placental cyst, to 13 cm, which ultimately led to delivery due to suboptimal fetal growth and umbilical cord entrapment against the uterine wall. Review of the literature, including inconsistent nomenclature and pathologic findings, will be discussed.

Conclusion: Large subchorionic placental cysts may be associated with suboptimal fetal growth. Serial ultrasound studies are indicated in these cases to evaluate fetal risk and potential umbilical cord involvement to aid in the appropriate timing of delivery.