Retroplacental haemorrhage (RPH) occurs when there is perigestational haemorrhage that is confined to the retroplacental space.
This type of haemorrhage occurs behind the placenta. The haematoma therefore separates the placenta from the uterine wall. The source of bleeding is probably from spiral arteries.
- in late pregnancy, it is typically caused by an placental abruption
Sonographically, a retroplacental haematoma may mimic a thickened placenta because the haematoma is commonly isoechoic to the placenta. It should suspected if the retroplacental hypoechoic zone is thickened to >2 cm 6. Otherwise, the retroplacental haematoma may be hypoechoic or may be of heterogeneous echogenicity.
Colour Doppler interrogation will reveal absence of internal blood flow - this finding allows differentiation of haematomas from other placental masses.
For sonographic appearances of increased placental thickness consider
- retroplacental myometrial contraction
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- placental anatomy
- placental developmental abnormalities
- placenta previa
- spectrum of abnormal placental villous adherence
- abnormalities of cord insertion
- abruptio placentae
- placental pathology
- vascular pathologies of placenta
- placental infections
- placental masses
- molar pregnancy
- twin placenta