[Idiopathic hypereosinophilic syndrome].

The idiopathic hypereosinophilic syndrome is defined by the combination of prolonged eosinophilia and evidence of tissue damage including heart and nervous system. Cardiac disease is the major cause of mortality. The idiopathic hypereosinophilic syndrome is a heterogeneous collection of disorders. Products of activated eosinophils could exert toxicities on specific organs; it is a diagnosis of exclusion. There is no specific tests diagnostics. The development of a comprehensive diagnosis and therapeutic approach ensure from a better understanding of the pathogenesis.