A 31-year-old man presented with rapid onset of intractable congestive heart failure during the course of chemotherapy for eosinophilic leukemia. Patients with a hypereosinophilic syndrome usually die from complications of eosinophilic infiltration and fibrosis in target organs. The resulting cardiac lesions are a cause of death among these patients. Surgical intervention enabled our patient to survive the immediate medical crisis and has prolonged his life.
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