Posted 7/29/2014 2:39 AM (GMT 0)
It is estimated there are about 50,000 patients with one or other of the myositis diseases: pm, dm, sIBM, and hIBM. Although there are no official estimates sIBM seems the most prevalent, then dm, then pm, and finally hIBM which is very rare. I personally believe there are more but they are misdiagnosed or have an overlap syndrome and not classified with a myositis disease.
I have never heard of someone actually diagnosed by a myositis expert with both pm and dm. They are entirely different diseases...one B cell the other T cell. IBM is often misdiagnosed as PM only to be changed after not responding to treatment. There is no effective treatment for IBM at this time.
The Myositis Association has a website and community forums as well as a FB page. There are a number of FB groups for myositis if you are interested.
Bill