The rheumatologist think it's related to the arthritis. I have a couisin who has it and has had eye and lung problems and now has problems with her kidneys. It can affect any organ in the body from what I've read. Did your husband have arthritis orany immine system disease when he got it? Just like the arthritis, they don't rally know what causes it. There's an excellent article about
it on the Mayo Clinic website
www.mayoclinic.com. I should know more tomorrow after I see my primary doctor, I'll let you know and thank's for the support
Alicat