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The choroid plexus is a tissue in your baby’s brain that produces cerebrospinal fluid, which surrounds your baby’s brain and spinal cord. In a small number of pregnancies a tiny bit of fluid is pinched off when the choroid plexus is formed and it appears on an ultrasound as a fluid-filled cyst, called a choroid plexus cyst. These cysts could be a concern because they are common in babies who have Edward’s Syndrome. The good news is that in most pregnancies these cysts are harmless and will disappear by week 28. This episode gives a brief overview of choroid plexus cysts, how they are diagnosed, and what they mean for you and your baby.