Choroid Plexus Cysts

Hi mummies! I just went for my 20 week detailed scan at SGH under Dr Pamela. :) in the ultrasound they found a choroid plexus cyst on bb's brain. She did mention its a marker for Trisomy 18 but there are chances of it just being a water bubble which will go away on its own. Any mummies experienced this too and went to have a healthy pregnancy and bb? TIA!