Brain cysts??

I just turned 23 weeks today and at our 20 weeks ultrasound, they found cysts in the babys brain. They informed us that this could be an indicator of trisomy 18. We had a specialized ultrasound 2.5 weeks later, hoping that the cysts would be gone, but they weren't. The Dr informed us our baby has no other indicators of trisomy 18 which is good, but that there is still around a 1-2% chance that it could be trisomy 18. Has anyone else had the cysts show up with their baby, and had everything clear up?