Brain Abnormalities Found in my Anatomy Scan

Im 26 weeks and a couple days ago i had to redue my anatomy scan due to my baby being in a position where they couldnt see his face. The results came back and the doctor told me they think he has problems in his brain and its a separtion in the middle. I have to go and see fetal medicine specialist next week to get a ultrasound with them. Im naturally beyond worried but they said theres a chance it could be nothing and theres a chance it could severe. Can anyone relate? I didnt see this coming at all. My baby has always been healthy he kicks constantly with a HR of 154. His head is measuring a week behind but im not so worried about that my family has really small heads and the doctor said that was fine. I freaked out and went to buy a 3D/4D & HD live ultrasound this morning to make sure everything is okay because they wouldnt see his lips at the doctors office and everything was fine. Im just worried about his brain. The office said that kind of brain problem if severe can cause walking/talking delays. Im going to insert pictures of my report and baby for you guys to see. Any advice helps thank you!