Polymyositis & Dermatomyositis Support Group
Polymyositis (PM) is a type of chronic inflammation of the muscles (inflammatory myopathy) related to dermatomyositis and inclusion body myositis. The inflammation is predominantly of the endomysium in polymyositis, whereas dermatomyositis is characterized by primarily perimysial inflammation.
I think LexisGirl posted the link on the thread entitled, "TMA Conference - who is going?". This thread has been active in the past few days, so it should be easy to find. If not, let me know and I'll try to do a copy and paste from that thread.
~Lucky