“…With regard to the prognosis of polymyositis and dermatomyositis, it is now well recognized that up to 50% of the florid cases terminate fatally, usually from pharyngeal or respiratory paralysis or from associated bronchopneumonia. In many of the others the disease becomes arrested, with varying amounts of residual disability (Oppenheim, 1903;Brock, 1934;O'Leary and Waisman, 1940;Sheard, 1951).…”