Some of you might have come across my previous threads.
Basically, they found at the 20 week scan that the ventricles of my baby's brain are enlarged, also that the femur was too short. Since then I've had repeat scans and an amnio (which was clear). After the last scan I was referred to the regional fetal medicine unit. The consultant there scanned me today. He found the size of the ventricles of the brain to be around 15 mm, which is borderline between mild and severe enlargement and the biggest measurement we've had so far. He also found the measurements for femur and humerus too short for dates, and too much amniotic liquid. As a result he feels "anxious" (his words) that there is a genetic problem. But he hasn't come across a case quite like ours before, so he has no idea what it could be. According to him we could be looking at anything from no to very mild problems to severe handicap. 
We are now going to have an MRI scan, but while that will show if the structures of the brain are okay, it will still not tell us if the brain is actually working properly. He will also do another scan in two weeks' time to review. But he said we might not know until some time after birth if there is a problem and how severe it is.
I feel totally crushed and the uncertainty is driving me insane. Our baby could be fine, or he might be so ill that he won't even survive. 
I didn't expect this at all today, I was so hopeful that he would reassure us because the consultant at out local hospital had said that the length of the femur had no further implications after the clear amnio, and when they scanned here they didn't say anything about the amniotic fluid.
Part of me wants to believe that the consultant today just got it wrong, but as dh said that's silly because he's an expert and experienced and knows what he's doing.
I'm having so many black thoughts, from wishing I had never got pregnant in the first place... I remember the night of conception, dh wasn't in the mood but I made him do "it" so we could get pregnant... maybe I shouldn't have.
Then fearing that my life will never be the same again, all our dreams and plans out of the window, the lives of my two dd's altered forever...
god I can't go on it's just so bad, I want to feel hope but then I felt hopeful this morning and it all went wrong, so maybe I should just assume the worst. 
I don't know anything anymore.