Bronchial tumors and mesothelioma. (A) Bronchial adenoma, papillary. (B) Higher magnification of 4A. Note monomorphic population of tumor cells originating from the bronchial epithelium. (C) Bronchial carcinoma. (D) Higher magnification of 4C. Note nests and tubules of anaplastic tumor cells infiltrating into the adjacent parenchyma. (E) Mesothelioma, epithelial. (F) Higher magnification of 4E. Note fronds of epithelial tumor cells originating from the pleura. H & E. A, B: C3A mouse, NNK; C, D: rat, M, asbestos, amosite; E, F: F344/N rat, mid-dose female (MF), dibromoacetic acid.