Abstract
A case of pulmonary eosinophilic granuloma confirmed by transbronchial lung biopsy (TBLB) is reported. A 63-year-old man was admitted to our hospital complaining of productive cough and exertional dyspnea. Chest roentgenogram and computed tomography showed bilateral linear and reticular shadows predominantly in the upper and middle lung fields. TBLB was performed and the specimens showed granulomatous lesions consisting of histiocytes with infiltration of eosinophils. Histiocytes were positive for S-100 protein by immunohistochemistry. He was diagnosed as having pulmonary eosinophilic granuloma. In the diagnosis of pulmonary eosinophilic granuloma, open lung biopsy is useful, but TBLB is also useful for diagnosis in the active or early stage of this disease.
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