Malignant lymphoma associated with marked eosinophilia.

A 60-year-old black man with poorly differentiated lymphocytic lymphoma presented with generalized lymphadenopathy and marked eosinophilia. Extensive evaluation of the eosinophils revealed them to be normal morphologically and functionally. The patient responded to corticosteroid therapy with resolution of the lymphadenopathy and reversion of the peripheral blood counts to normal limits. Recurrence of the original clinical picture within months prompted institution of systemic chemotherapy. Response was transient, and the patient expired after an unremitting downhill course. Recent advances in our knowledge of mechanisms of eosinophilia and eosinophil function are reviewed. The relationship of lymphoma to eosinophilia is discussed.