#Mass in the sigmoid colon, what is your next step?

A 48-year-old woman presented with chronic left side abdominal pain and weight loss. The pain began 2 years ago. The patient underwent colonoscopic examination. The scope revealed a sigmoid mass. The mass is diffuse and easily bleeds on the touch. The scope passed the area of colonic mass with difficulty. The rest of the colon is free. What is your next step?