Fig. 2From: Pathological complete response after afatinib treatment of stage IV oligometastatic adenocarcinoma of the lung: the role of pulmonary surgeryBiopsies and staining results. a Biopsy from the third lumbar vertebra, TTF-1(+). b Bronchoscopic biopsy from the RB10, TTF-1(+). c Lung adenocarcinoma with complete tumor regression with cholesterol crystals and multinucleate giant cells. Hematoxylin and eosin stains. d Lymph node: anthracosis onlyBack to article page