A doctor making a spelling mistake like that, a very common word, seems a little bit unlikely and I'd have thought a part of the body would be mentioned as well if it was inflammation.
Also, I think there is a letter before the in..... I don't think that character is connected to the number four. A larger image might help.
My next guess was infantilism, q.v., but again it doesn't quite look right.
(Infantilism, also known as infantile speech, a speech disorder in which early speech stages persist beyond the age they are normally expected to fade.)
But I've never heard of anybody dying of it.
Zaph