Case 7. A, Right lower lobe adenocarcinoma, mixed subtype with papillary and bronchioloalveolar patterns (hematoxylin and eosin; original magnification, 40). B, Bronchioloalveolar carcinoma-like nodule in the right middle lobe not seen on preoperative CT scan (hematoxylin and eosin; original magnification, 40). C, Sequenom genotyping assay showing the presence of G 3 T mutation at position 35 in KRAS codon 12 (G12V mutation) in the mixed-type adenocarcinoma of the right lower lobe. The germline peak is indicated by an asterisk and the mutant peak by an arrow. CT, computed tomography.