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 may be divided into two types dependant on location:
- within the placental tissue (placental septal cysts)
- under the fetal plate (subchorionic/surface cyst)
May be seen as anechoic rounded to ovoid cysts in association with placental tissue. Colour Doppler interrogation shows no evidence of any vascular flow.
- large cysts (often those over 4.5 cm) or multiple cysts may be a causative factor in intra-uterine growth restriction (IUGR) especially when attached in close proximity to the umbilical cord insertion site 1,3.
- 1. Brown DL, Disalvo DN, Frates MC et-al. Placental surface cysts detected on sonography: histologic and clinical correlation. J Ultrasound Med. 2002;21 (6): 641-6. J Ultrasound Med (full text) - Pubmed citation
- 2. Elsayes KM, Trout AT, Friedkin AM et-al. Imaging of the placenta: a multimodality pictorial review. Radiographics. 29 (5): 1371-91. doi:10.1148/rg.295085242 - Pubmed citation
- 3. Raga F, Ballester MJ, Osborne NG et-al. Subchorionic placental cyst: a cause of fetal growth retardation--ultrasound and color-flow Doppler diagnosis and follow-up. J Natl Med Assoc. 1996;88 (5): 285-8. - Free text at pubmed - Pubmed citation
- 4. Shipley CF, Nelson GH. Prenatal diagnosis of a placental cyst: comparison of postnatal biochemical analyses of cyst fluid, amniotic fluid, cord serum, and maternal serum. Am. J. Obstet. Gynecol. 1993;168 (1 Pt 1): 211-3. - Pubmed citation
- 5. Prayer D. Fetal MRI. Springer Verlag. (2011) ISBN:3540732705. Read it at Google Books - Find it at Amazon