Juvenile dermatomyositis in Western Switzerland

Introduction Juvenile dermatomyositis (JDM) is a rare chronic, autoimmune vasculopathic disease with mainly muscle and skin involvement. The incidence described in USA is 2.5-4.1 cases per million children; the disease is slightly more common in girls. Recent studies describe that two third of the patients followed a chronic disease course, whereas only one third showed monocyclic disease course.