brain tumors

Ok, so my cousin just found out he has a brain tumor and went in after the swelling went down and had surgery. He ended up finding out that he has a very rare type of cancer...especially for adults. It is Teratoid/Rhabdoid(at/rt). It is usually found in babies and toddlers. Well, he in 34 years old and I have tried to research this, but I do not understand the "doctor" terms that they use...if anyone could help me out, I'd be very greatful...Thank you for taking the time to read this