My son is three now, when he was one i was told he had a cyst on his brain that they saw via ultrasound, two weeks later when looking at his MRI results his dr. said the cyst was gone but his brain was smaller than normal and there was more fluid then normal. he said that was okay, but that he should see a neurologist. we did and they said he was fine. I cant find any information on a smaller brain or more fluid. He is very intelligent for a 3 year old, but for the past year its like he cant seem to tell the difference between good and bad choices. I am just trying to find something! i have talked to drs and no one seems to think its an issue.