Abstract
We experienced a case of eosinophilic pneumonia that required differential diagnosis with lung cancer. A 64-year-old woman was admitted to our hospital complaining of fever elevation and cough. X-ray findings showed an abnormal nodular shadow in her left upper lung field. A mass shadow with infiltrates was also present in her chest CT view. FDG-PET/CT scanning revealed a strong positive reaction in the left upper lobe lesion. Fiberoptic bronchoscopy showed white plaques with edematous changes. We were able to obtain definitive diagnosis of eosinophilic pneumonia because the microscopic findings of the tissue specimen revealed infiltration of numerous eosinophils into the bronchial wall without findings of malignancy. Administration of antiallergic agents and steroid therapy improved the patient's clinical findings. Transbronchial lung biopsy (TBLB) is useful for differential diagnosis between malignant and benign diseases.
