Placental cyst

Last revised by Jeremy Jones on 20 Sep 2021

Placental cyst refers to a simple cystic lesion that develops in relation to the placenta.

Their estimated prevalence is at 2-20% of all pregnancies.

They can be categorized by location:

May be seen as an anechoic rounded/ovoid cyst in association with placental tissue. Color Doppler interrogation shows no evidence of any vascular flow.

  • large cysts (greater than 4.5 cm) or multiple cysts may be a causative factor in intrauterine growth restriction especially when in close proximity to the umbilical cord insertion site 1,3

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