The prognosis for idiopathic hypereosinophilic syndrome is poor without treatment, with medium survival of approximately 1 year.

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Idiopathic hypereosinophilic syndrome (HES) is a condition characterized by the persistent overproduction of eosinophils, a type of white blood cell, without an identifiable cause. Without appropriate treatment, the prognosis is poor due to the damage that the excessive eosinophils can cause to multiple organs, including the heart, nervous system, and skin. The median survival time without treatment is indeed approximately 1 year, highlighting the importance of early diagnosis and management.

The Prognosis for Idiopathic Hypereosinophilic Syndrome Is Poor Without Treatment