Fig. 3

Pathological findings of mixed GGN in the posterior basal segment of the left lower lobe. a Predominantly papillary or glandular architecture covering single layer columnar epithelial cells with few ciliums (magnification 200 ×). b Multiple discontinuous skipping small lesions around the main lesion (magnification 50 ×). c Immunohistochemical staining showed positive for TTF-1 (magnification 200 ×). d–f: Immunohistochemical staining showed partial positive for Napsin-A, P63 and CK5/6 (magnification 200 ×)