Fig. 3

BALF and TBLB at the onset of DILD. Giemsa staining of the BALF at a magnification of ×200 (a) showing an increase in the proportion of lymphocytes (34.4%). Hematoxylin and eosin staining of the TBLB specimen at a magnification of ×200 (b) showing exudate and inflammatory cell infiltration in the alveolar space with alveolar wall thickness. No findings suggestive of cancer infiltration were observed. BALF bronchoalveolar lavage fluid, TBLB transbronchial lung biopsy, DILD drug-induced interstitial lung disease