Hardening Of The Lungs Fluid Around Heart And Lungs?

Fluid around heart and lungs? - hardening of the lungs

My grandfather to the hospital today because I do not breathe (for the second time I went to the hospital for this) and it was found that accumulation of fluid in order to have the heart and lungs. It has had a very rare disease, which has the same effect as Alzheimer's, but due to leakage of cerebrospinal fluid in the brain caused by the hardening and cause stress to the brain. Can someone tell me what this means and how serious? Thank you.