Try not to worry too much (easier said than done I know). For what it is worth there is a school of thought that believe choroid plexus cysts at this stage are just a variation of normal and we are ony picking them up more now because of better scanning techniques. Many many bubs have them at this stage. It is only if the cysts do not resolve inthe third trimester or if there are other markers of abnormality that they then are more of an issue. A friend went through a couple of weeks of panic just like you recently until she found this out.