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Cher, these are known as choroid plexus cysts. The choroid plexus is the tissue within the brain, which produces the cerebrospinal fluid. Do you know the dimensions? They have no significance except that they may indicate a slight increase in risk for trisomy 18 when they are over 10mm. So an amnio could be done if the cyst is greater than 10mm or if there are cysts on both sides. Whether there is really a risk increase is a subject of much debate in the medical community. There have been attempts by some scientists to link them to trisomy 18 (aka down syndrom) but the data I've seen on that argument is sketchy at best and statistically insignificant (1-1.5% with a 4% margin of error). I'm quite sure it will go away as it *always* does. Good luck and congatulations!

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