Discovery of primary lung cancer following resection of rectal cancer lung metastasis: A case report

Figure 1 Endoscopic plus mass biopsy and postoperative pathology of a circumferential bulging mass in the rectum. A: Endoscopic image of a malignant rectal tumor; B: Hematoxylin-eosin staining (× 100) of rectal mass biopsy tissue; C: Hematoxylin-eosin staining (× 100) of postoperative rectal mass tissue.