21 weeks ultrasound

Opinions needed and curiosity to see if this has happened to any of y’all. So I had my 21 week ultrasound yesterday where they measured all his body parts. Well we received news that he has a cyst on his brain however, both sets of my genetic testing have come back negative and his anatomical measurements are where they should be. What worries me is that a cyst on the brain can cause a high risk pregnancy if it does not go away by 32 weeks. Have any of y’all heard of this or had a similarity??? Being a first time mom I’m terrified that maybe I’ve done something wrong. Regardless if this is something my child will be stuck with he will be loved unconditional. I’m just seeing if y’all know of this. The medical term for this cyst is “choroid plexus cyst”