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Intestinal Tumors | 마이메르시 MyMerci
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Intestinal Tumors

NCLEX Review Guide: Intestinal Tumors

Pathophysiology & Types

Colorectal Cancer Overview

  • Colorectal cancer is the third most common cancer, typically arising from adenomatous polyps that undergo malignant transformation over 5-10 years.
  • Most tumors are adenocarcinomas located in the rectum and sigmoid colon, with right-sided tumors often presenting later due to larger bowel diameter.
  • Risk factors include age >50, family history, inflammatory bowel disease, high-fat/low-fiber diet, and genetic syndromes like familial adenomatous polyposis (FAP).

Memory Aid: "CHANGE" for Early Warning Signs

  • Change in bowel habits
  • Hematochezia (blood in stool)
  • Abdominal pain/cramping
  • Narrow stools (pencil-thin)
  • Gas, bloating, fullness
  • Energy loss/fatigue

Key Points

  • Right-sided tumors cause anemia and fatigue; left-sided tumors cause obstruction and bleeding
  • Screening begins at age 45-50 with colonoscopy every 10 years

Clinical Manifestations & Assessment

Signs & Symptoms by Location

Right-Sided (Ascending)Left-Sided (Descending)
• Iron-deficiency anemia
• Occult bleeding
• Fatigue, weakness
• Dull abdominal pain		 • Bright red blood in stool
• Change in bowel habits
• Narrow stools
• Cramping, obstruction
  • Critical Assessment: Unexplained iron-deficiency anemia in adults >50 requires immediate colonoscopy to rule out colorectal cancer.
  • Advanced disease presents with weight loss, abdominal mass, hepatomegaly (liver metastases), and signs of bowel obstruction.

Clinical Scenario

A 65-year-old patient reports fatigue and shortness of breath. Labs show Hgb 8.2 g/dL, MCV 70 fL. No obvious bleeding source. Priority action: Refer for colonoscopy - iron-deficiency anemia in elderly may indicate occult GI bleeding from colorectal cancer.

Diagnostic Studies & Staging

Diagnostic Workup

  • Colonoscopy with biopsy is the gold standard for diagnosis, allowing direct visualization and tissue sampling of suspicious lesions.
  • Carcinoembryonic antigen (CEA) levels are elevated in 70% of patients and used for monitoring treatment response and detecting recurrence.
  • Staging includes CT chest/abdomen/pelvis, and TNM staging system determines treatment approach and prognosis.

Staging Memory Aid: "TNM"

  • Tumor size and local invasion
  • Node involvement (lymph nodes)
  • Metastases (distant spread)

Treatment & Nursing Management

Surgical Interventions

  1. Preoperative Care: Bowel preparation with clear liquids, laxatives, and antibiotics to reduce infection risk
  2. Surgical Options: Colectomy (partial or total), low anterior resection, or abdominoperineal resection with possible colostomy
  3. Postoperative Care: Monitor for anastomotic leak, infection, and return of bowel function
Critical Complication: Anastomotic leak presents with fever, abdominal pain, and elevated WBC 3-7 days post-surgery. Notify physician immediately.

Chemotherapy & Radiation

  • Adjuvant chemotherapy with 5-fluorouracil (5-FU), oxaliplatin, and irinotecan improves survival in Stage III disease.
  • Neoadjuvant radiation therapy may be used for rectal cancers to shrink tumor before surgery.

Key Nursing Interventions

  • Monitor for signs of bowel obstruction: absent bowel sounds, abdominal distention, nausea/vomiting
  • Assess stoma if colostomy present: color (should be red/pink), output, and skin integrity
  • Provide emotional support and refer to support groups for body image concerns

Commonly Confused Concepts

ConceptKey DifferenceNCLEX Tip
Colostomy vs Ileostomy Colostomy: formed stool, less output
Ileostomy: liquid stool, high output		 Ileostomy requires more frequent monitoring for dehydration
CEA vs CA 19-9 CEA: colorectal cancer monitoring
CA 19-9: pancreatic cancer		 CEA used for follow-up, not initial diagnosis
Screening vs Diagnostic Screening: asymptomatic patients
Diagnostic: symptomatic patients		 Screening colonoscopy starts age 45-50

Quick Check: Ostomy Care

Healthy stoma characteristics: Red/pink, moist, no bleeding with gentle touch. Concerning signs: Dark purple/black (ischemia), excessive bleeding, prolapse.

Study Tips & Self-Assessment

High-Yield NCLEX Points

  • Iron-deficiency anemia in elderly = investigate for GI bleeding
  • Right-sided tumors = anemia; Left-sided tumors = obstruction
  • Post-op colectomy: watch for anastomotic leak (fever + abdominal pain)
  • Healthy stoma = red/pink and moist

Self-Assessment Checklist

  • ☐ Can I differentiate between right and left-sided tumor presentations?
  • ☐ Do I know the warning signs of anastomotic leak?
  • ☐ Can I identify normal vs abnormal stoma characteristics?
  • ☐ Do I understand when to use CEA monitoring?
  • ☐ Can I explain screening guidelines for colorectal cancer?
Common Pitfall: Don't confuse screening age (45-50 for average risk) with diagnostic workup for symptomatic patients (any age with concerning symptoms).

Remember: You're preparing to save lives and provide compassionate care. Every concept you master brings you closer to becoming the nurse your patients need. Stay focused, stay positive, and trust your preparation!

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