Fig. 2From: Perioperative risk factors for survival outcomes in elective colorectal cancer surgery: a retrospective cohort studyInfiltration of inflammatory cells at the tumor margin under optical microscopy. Images a and b indicate low-grade inflammatory cell infiltration (magnification: a, × 4; b, × 10), and images c and d indicate high-grade inflammatory cell infiltration (c, × 4; d, × 10)Back to article page