Colorectal Cancer & Ostomy Care

Colorectal cancer is the second leading cause of cancer death in the U.S., yet early-stage detection through screening changes survival from 15% to over 90%. The stoma that follows surgery brings its own critical nursing territory.

Colorectal cancer risk rises sharply after age 45, with screening recommended starting at that age (colonoscopy is one of several accepted modalities). Key risk factors include familial adenomatous polyposis (FAP), Lynch syndrome, a history of ulcerative colitis longer than 8–10 years, high-fat/low-fiber diets, and smoking. The hallmark warning sign is a change in bowel habits — alternating constipation and diarrhea — plus rectal bleeding and ribbon-shaped stools suggesting a left-sided lesion. Right-sided tumors are more insidious, presenting with iron-deficiency anemia and vague abdominal pain rather than obvious stool changes. CEA (carcinoembryonic antigen) is used to monitor treatment response and recurrence, not as a screening tool. Surgical resection often results in a colostomy or ileostomy. A colostomy produces formed to semi-formed stool; an ileostomy produces liquid, enzyme-rich effluent that is highly corrosive to peristomal skin. Stoma assessment follows the rule: it should be beefy red and moist — a dusky, pale, or cyanotic stoma signals compromised circulation and requires immediate provider notification. Pouch the stoma within 24–48 hours postop. The appliance opening should be cut to 1/8 inch larger than the stoma to protect surrounding skin without constricting tissue.

Key Distinctions

Don't confuse CEA with a diagnostic screening tool — it monitors recurrence, not initial detection. Students mix up colostomy output (formed) with ileostomy output (liquid and caustic); the ileostomy demands more aggressive skin protection and fluid/electrolyte monitoring. A dark or dusky stoma indicates ischemia, not normal postoperative swelling — this distinction drives urgency of intervention.

Clinical Pearl

Right side hides, left side shows. Right-sided colon tumors cause silent anemia; left-sided tumors change stool shape and cause visible bleeding. Think 'right = sneaky, left = obvious.'