Molly, it's very frustrating to be getting the info second hand when my parents don't ask the right questions. I want to know why, how, what......exactly. My parents don't know what it is called (and that would be my first question) and since it is rare and there are extremely few cases to compare it to, I don't know if there is a prognosis. They are going to try things. As far as I know, so far, the chest cavity fills up with a lot of fluid. I don't know if that is all that is going on. The lymph system is malfunctioning. Hopefully in two weeks, I'll find out more. I will volunteer to go with to the vets and see if I can get more info.