Choroid plexus cyst?

Chelsea
Had my 20 (21) week anatomy scan today and baby is fine all except a cyst on her brain. Midwife kinda just brushed it off and scheduled a follow up ultrasound for two months from now. But of course I've been researching and now I'm scared to death. I had never heard of this even as a possibility with my first child. Anyone have any experience or advice??