Snapshot A 68-year-old man presents to his primary care physician for fatigue. He reports a change in his bowel habits and noticed his stool is pencil thin. He also endorses an unintentional 20-pound weight loss over the course of 2 months. His father died of colon cancer when he was 65 years of age. He has never had a colonoscopy. Physical examination is notable for tenderness upon palpation in the left abdomen. Laboratory studies are notable for iron deficiency anemia. Colonoscopy is notable for a colonic mass in the descending colon. Introduction Overview login to view 3 more bullets Epidemiology login to view 16 more bullets Pathogenesis login to view 11 more bullets Associated conditions login to view 2 more bullets Presentation Clinical presentation depends on the location of the colorectal cancer Symptoms/physical exam login to view 11 more bullets Imaging Colonoscopy login to view 13 more bullets Differential Diverticulitis login to view 2 more bullets Treatment Treatment is geared towards the staging of the malignacy Surgical login to view 4 more bullets Complications Colonic obstrucition Bowel perforation Metastasis