What are the current guidelines for managing adult small‑intestinal intussusception?

Management of Adult Small Intestinal Intussusception

Adult small bowel intussusception requires surgical resection when a lead point is identified, when malignancy cannot be excluded, or when clinical signs of obstruction, ischemia, or peritonitis are present; conservative management with close observation is appropriate only for incidental, asymptomatic cases without these features.

Initial Diagnostic Approach

CT scan is the gold standard imaging modality for adult small bowel intussusception 1, 2. Look specifically for:

• The characteristic "target" or "sausage-shaped" configuration
• Presence of a lead point (mass, polyp, or other pathology)
• Signs of bowel obstruction (dilated proximal bowel, transition point)
• Signs of ischemia (bowel wall thickening, pneumatosis, free fluid)
• Length of the intussusception segment

Risk Stratification for Malignancy

High suspicion for malignancy is mandatory in adults, as this fundamentally differs from pediatric intussusception 1, 2. Red flags requiring surgical intervention include:

• History of malignancy (increases lead point probability 3.7-fold) 3
• Age >60 years (increases lead point probability 2.2-fold) 3
• Mass visible on CT (increases lead point probability 2.9-fold) 3
• Weight loss, iron deficiency anemia 1
• Elevated white blood cell count 4
• Longer intussusception length 4

Management Algorithm

Surgical Resection (Primary Approach)

Proceed directly to surgery when:

• Any colonic or ileocolic intussusception (100% have lead points; high malignancy risk) 3
• Small bowel intussusception WITH any of the following:
  • Identifiable lead point on imaging 2, 3
  • Clinical obstruction 4
  • Signs of peritonitis, strangulation, or ischemia 5
  • Patient age >60 years with history of malignancy 3
  • Symptomatic presentation (pain, vomiting, obstruction) 2

Surgical approach: Perform en bloc resection without reduction for colonic intussusception due to high malignancy risk 6. For small bowel intussusception, intraoperative assessment determines whether reduction followed by resection or primary resection is appropriate 6, 2.

Conservative Management (Selective Cases Only)

Consider observation ONLY when ALL criteria are met:

• Incidental finding on CT (asymptomatic or minimally symptomatic) 2, 4
• No identifiable lead point on imaging 4, 7
• No signs of obstruction (no dilated bowel, patient passing stool/flatus) 4
• Normal white blood cell count 4
• Short intussusception length 4
• Age <60 years without cancer history 3

Conservative protocol: Short-term follow-up imaging (ultrasound, contrast studies, or repeat CT) within 24-48 hours to confirm spontaneous reduction 4. Studies show 82% of carefully selected cases resolve spontaneously without recurrence 4.

Critical Pitfalls to Avoid

Do not attempt non-operative reduction in adults as you would in pediatric cases—the high association with pathologic lead points (46% in small bowel, 100% in colonic) makes this dangerous 2, 3. The increasing detection of transient, asymptomatic intussusception on routine CT scans can lead to overtreatment; these specific cases may be observed, but any symptomatic presentation warrants surgical exploration 2.

Retrograde intussusception (jejunum telescoping backward after gastrojejunostomy) has 0% lead point probability and may be managed conservatively 3, but this represents a distinct clinical entity.

Duration of Conservative Trial

If conservative management is attempted, do not exceed 72 hours without clinical improvement, as delays increase morbidity and mortality 5. However, this 72-hour rule applies primarily to adhesive small bowel obstruction; for intussusception specifically, the threshold for surgical intervention should be lower given malignancy concerns 5, 2.