Summary

Hypereosinophilia is defined as the absolute eosinophilic count of above 1500 cells/µL in the peripheral blood on two separate tests taken during one month and/or the pathological confirmation of hypereosinophilia. There are many conditions that are associated with increased eosinophil counts including: parasitic infections, drug reactions, eosinophilic granulomatosis with polyangiitis, allergic reactions, drug reaction with eosinophilia and systemic symptoms (DRESS), primary immunodeficiencies (PID), eosinophilic gastrointestinal diseases (EGID), familial hypereosinophilia, and neoplasms [1]. Molecular classification may be an adjuvant in the classification of hypereosinophilia [2]. Our patient presented with hypereosinophilia as part of a paraneoplastic syndrome.