Oh! I have one!

My T (whom you all know is extremely empathetic and practically amazing) used to be NPD. She went to therapy for more than 10 years for it and other things, and is now most definitely not. People say NPD can't be helped, but the problem is most NPD's don't want to be helped, not that they can't be. She has written a book about her experiences of being NPD, and how she was able to heal, and what others can do if they or someone they know has NPD. It's very interesting.