I believe that he did have cancer some time ago. Since there's never been any evidence that he ever had a brain, it couldn't have been brain cancer. :=)
I thot’ it was a couple of brain aneurysms...? My sister in law had three brain aneurysms...two surgeries to repair...came out of it A-OK except she sets off all the bells and whistles going thru’ security at the airports with the mesh, screws, etc inside her head.