Retroplacental complex

Last revised by Dr Tim Luijkx on 03 Jun 2016

Retroplacental complex (RPC) is the region behind the placenta and is composed of decidua basalis and portions of myometrium including the maternal veins which drain the placenta.

  • visualized post 20 weeks of gestation
  • seen as an echo-poor, subplacental region with linear horizontal echoes representing venous channels
  • Doppler flow is noted within the vascular channels
  • the thickness can go up to 9.5 mm

Prominent retroplacental complex in an anteriorly placed placenta may be a cause of torrential bleeding during invasive procedures such as Cesarean section or amniocentesis.

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