Two similar adenocarcinomas. Comprehensive histologic review of case 7 (paraffin-embedded, formalin-fixed tissues, hematoxylin and eosin staining). The following morphological subtypes are identified in tumor A (panel A1, x40): 80% papillary (panel A2, x200), 10% acinar, and 10% papillary (panel A3, x200). Tumor B (panel B1, H&E staining, x40) is exclusively made of papillary areas (panel B2, x200). These similar morphological features suggest these tumors correspond to metastatic lung cancer.