Bronchiolar adenoma with unusual presentation: Two case reports

Figure 3 Immunohistochemical staining in case 1. Thyroid transcription factor 1 was expressed in bronchioles and the surrounding tumor glands, with the only difference being intensity. The results of P40, P63, and cytokeratin 5/6 staining were the same, and positive staining was detected only in the bilayer structures of the tumor. Collagen IV staining showed the presence of alveolar structure, and the Ki-67 index was low. A: Thyroid transcription factor 1; B: P40; C: Cytokeratin 5/6; D: P63; E: Collagen IV; F: Ki-67.