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Paraneoplastic eosinophilia is an unusual manifestation that usually remains asymptomatic. In this report, we presented the case of an 82-year-old patient with poorly differentiated lung adenocarcinoma and asymptomatic eosinophilia. The patient's condition worsened rapidly over a week, with episodes of cognitive disturbance, shortness of breath and acute kidney dysfunction. These symptoms were associated with a 4-fold increase in circulating eosinophil counts. The poor condition hindered further anticancer treatment. Treatment of the eosinophilia with corticosteroids and hydroxyurea significantly reduced circulating eosinophil counts to below the initial levels. Results of this case report suggested that lung cancer patients should be monitored closely for rapidly worsening symptoms of cognitive disturbance and respiratory insufficiency as signs of life-threatening asymptomatic eosinophilia, in order to initiate corticosteroid treatment.

oncology letters

Rapidly evolving asymptomatic eosinophilia in a patient with lung adenocarcinoma causes cognitive disturbance and respiratory insufficiency: Case report