Successful resection of colonic metastasis of lung cancer after colonic stent placement: A case report and review of the literature

Figure 3 Macroscopic and microscopic findings. A: A circumferential protruding tumor in the descending colon with stent-induced mucosal changes; B: Hematoxylin and eosin (HE) staining (× 40), the tumor shows the appearance of squamous cell carcinoma, mainly confined to the submucosal layer; C-E: Immunohistochemical staining for CK5/6 (C, × 200), p40 (D, × 200), and CDX2 (E, × 400). The tumor cells are positive for CK5/6 and p40, and negative for CDX2; F: HE staining of the lung biopsy specimen of the patient (× 40). The patient was diagnosed with squamous cell lung cancer.