Blood hyperreosinophilia: A diagnostic challenge.

A very detailed differential diagnosis is necessary to investigate the causes of blood hypereosinophilia. In the differential diagnosis of hypereosinophilia with pulmonary involvement, primary and secondary eosinophilic lung diseases should be kept in mind, and more specific diagnoses should be considered in those with a history of nasal polyposis and asthma. Here, it was aimed to present a case of organ-limited hypereosinophilia with asthma and nasal polyposis.