Management of F/P+/- hypereosinophilic syndromes: case report and treatment review.

Eosinophilia in clinical practice can occur due to various pathologic processes. Causes of eosinophilia include idiopathic eosinophilia, reactive eosinophilia, idiopathic hypereosinophilic syndrome (HES), chronic eosinophilic leukemia, and other hematopoietic neoplasms (myeloid, lymphatic, or mast cell). We present a case of a 22-year-old man with HES with remarkable clinical manifestations and treatment challenges.