Abstract
Peripheral blood eosinophilia is commonly encountered in clinical practice. The causes of peripheral blood eosinophilia are varied, ranging from benign eosinophilia to malignancy. A careful history and physical examination along with directed clinical evaluation may help determine the cause. When uncontrolled, peripheral blood eosinophilia may result in end-organ damage and life-threatening complications. This article summarizes the differential diagnosis and evaluation of persistent marked eosinophilia.
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