Well, I know a guy here at work whose granddaughter was born with her skull completely fused, and no soft spot. They gave her a surgery to open her skull so her brain could have room to grow properly.
She had no complications and is %100 healthy and happy.
Her before and after pictures even look different, as far as the shape of her head being a little abnormal before, and perfectly fine now.
So there is a sucess story for you. Maybe it is not as uncommon as it seems. Of course I am sure her family went through alot of fear and heartbreak before and during her procedures. Hopefully you can find some support to help assure you.
First, of course make sure you gain the opinion of at least 2 specialist. I wouldn't jump right in after one opinion with such a serious issue.
Good luck, God bless!