This is a good summary, especially if you're looking for something to share with family and friends who want to know what's going on and what our disease involves.
There are a couple points I disagree with and you may too. One is that with PM there is usually no pain. I've talked to plenty of PM patients who experience pain. So I believe every case is different.
I hope this is a helpful resource for you! As far as the prognosis, as I said before, every case is different.