[Fever, pneumonia and eosinophilia].

We present the case of a 71-year old man with acute eosinophilic pneumonia. By ruling out other common etiologies and by a positive lymphocyte transformation test the non-steroidal anti-inflammatory drug mefenamic acid was identified as the possible causative agent or this potentially life threatening lung disease. The clinical presentation, diagnosis, and treatment of acute eosinophilic pneumonia as a pulmonary manifestation of a drug-induced allergic reaction are discussed.