Figure 3
From: Bronchial sleeve resection for early-stage squamous cell carcinoma
Pathological findings. a, Grossly, the tumor was a whitish, elevated nodule, as indicated by arrow. b-c, The elevated portion was composed of inflammatory granulation tissue and regenerated epithelium. Squamous cell carcinoma in situ were found throughout the entire thickness of the epithelium at the elevated margin. d, Almost all atypical cells were positive for Ki-67.