Fig. 4
The figure shows the pathology after bronchoscopic biopsy. Microscopically, the tumor tissues are arranged in sheets and nests. Some neoplastic cell-nests have peripheral palisading, with typical keratinized peals (→) in the center. Tumor cells are light to moderate heteromorphic, with intercellular bridges. (H&E staining 200 times magnification). The diagnosis is lung squamous cell carcinoma