Question: An 85-year-old woman presented with a 5-month history of bowel habit change and bloody stool. Initially, she visited a local hospital for help. Her symptoms were intermittent attacks, were relieved with medication, and had increased in severity in the last month. She had developed nausea and anorexia without vomiting. She also noted a 15-kg reduction in body weight over the last 5 months. She visited the outpatient department for further examination through colonoscopy, the results of which showed luminal obstruction with distal fold invagination to the proximal area in descending colon (Figure A).