Intussusception is the invagination (telescoping) of one bowel segment into another, representing one of the most common pediatric abdominal emergencies. It predominantly affects children aged 3 months to 5 years, with peak incidence at 6–7 months (~62 per 100,000). [1-2] Approximately 75% of cases are idiopathic; 10–25% are associated with a pathologic lead point. [1-2] It is a true pediatric emergency — delay in diagnosis and treatment leads to bowel obstruction, ischemia, necrosis, perforation, and potentially death. [1-2]
1. History
- Intermittent, colicky abdominal pain — the most common symptom across all ages (60–84%); episodes of crying with drawing up of legs in infants [2-4]
- Vomiting — typically nonbilious early; bilious vomiting suggests obstruction or alternative diagnosis [2-3]
- Bloody or "currant jelly" stools — present in only 6–24% of cases; more common in infants <1 year and with prolonged symptoms [3][5]
- Irritability/inconsolable crying — especially in infants <12 months who cannot verbalize pain [5]
- Lethargy or altered mental status — an atypical but well-recognized presentation, particularly in younger infants; can be the sole presenting complaint [2][6]
- The classic triad (colicky pain, currant jelly stool, sausage-shaped mass) is present in <5–20% of cases [3][7]
- Ask about recent viral illness, URI, or gastroenteritis (may precede onset); recent rotavirus vaccination [7]
- Duration of symptoms: >12 hours associated with increased fever, diarrhea, peritoneal fluid, and abnormal radiographs [3]
2. Alarm Features
- Bilious vomiting — suggests bowel obstruction or malrotation with volvulus [8]
- Peritoneal signs (guarding, rigidity, rebound) — suggest bowel necrosis or perforation
- Hemodynamic instability — tachycardia, hypotension, poor perfusion → shock from bowel necrosis/sepsis
- Altered mental status or profound lethargy without other explanation [2]
- Prolonged symptom duration (>24–48 hours) — associated with higher rates of surgical intervention, bowel resection, and mortality [1][3][9]
- Abdominal distension with absent bowel sounds
- Bowel obstruction on radiograph — significantly decreased enema reduction success (21% vs 83%) and increased bowel resection rates [1]
3. Medications
- No specific medications cause intussusception, but rotavirus vaccination (particularly the withdrawn RotaShield) has been associated with a small increased risk (~5.3 additional cases per 100,000 infants); current vaccines (Rotarix, RotaTeq) carry a much smaller risk that is outweighed by benefits [7]
- Glucagon has been used as an adjunct during enema reduction (antispasmodic), but evidence does not support improved reduction rates [7]
- Dexamethasone — some evidence suggests it may reduce recurrence rates post-reduction, though the data remain limited [7]
- Antibiotics — not routinely indicated unless there is concern for perforation, peritonitis, or sepsis [7]
- Analgesics — pain should be appropriately treated; opioids do not decrease diagnostic accuracy. Only ~7% of children in the US receive sedation during reduction, though some data suggest sedation may improve reduction success [8][10]
4. Diet
- NPO upon presentation if reduction or surgery is anticipated
- Post-reduction: initiate clear fluids 2 hours after successful reduction; advance diet as tolerated [11]
- Successful feeding without recurrence of symptoms is a key criterion for discharge [11-12]
- No specific dietary triggers are associated with intussusception, though cold food intake and preceding diarrheal illness have been noted in some series [4]
5. Review of Systems
- GI: abdominal pain pattern (intermittent vs constant), vomiting (bilious vs nonbilious), stool character (bloody, mucoid, currant jelly), diarrhea, constipation, last bowel movement
- Constitutional: fever (present in minority; its absence is actually a predictor of intussusception), lethargy, irritability, poor feeding [13-14]
- Neuro: altered mental status, lethargy, hypotonia — atypical but important presentations [2]
- Skin: palpable purpura (consider Henoch-Schönlein purpura as cause of secondary intussusception) [8]
- Respiratory: recent URI symptoms (viral illness may precede intussusception)
6. Collateral History and Family History
- Caregiver observations are critical — intermittent episodes of inconsolable crying with pain-free intervals are highly suggestive
- Prior episodes of intussusception (recurrence rate ~8–13% after enema reduction) [15-16]
- Family history of Peutz-Jeghers syndrome (hamartomatous polyps as lead points, especially in older children) [17]
- Family history of celiac disease — an underrecognized association with intussusception in children [18]
- History of cystic fibrosis — associated with meconium ileus equivalent and intussusception
7. Risk Factors
- Age 3 months to 5 years (peak 5–9 months) [1-2]
- Male sex — male-to-female ratio ~1.5–2:1 [4-5]
- Recent viral illness (adenovirus, rotavirus, enterovirus) — lymphoid hyperplasia serves as a lead point [7]
- Rotavirus vaccination — small increased risk, particularly within 1–2 weeks of first dose [7]
- Henoch-Schönlein purpura — bowel wall edema/hematoma can serve as a lead point [8]
- Celiac disease — associated with recurrent small bowel intussusception [18]
- Prior intussusception — recurrence risk 8–13% after enema reduction [16]
- Pathologic lead points (more common in children >3 years): Meckel's diverticulum, duplication cysts, polyps, lymphoma, Peutz-Jeghers polyps [17][19]
- Postoperative state — small bowel intussusception can occur after abdominal surgery [1]
8. Differential Diagnosis
- Malrotation with midgut volvulus — bilious vomiting, surgical emergency; distinguish with upper GI series [8]
- Appendicitis — more common in older children; focal RLQ pain, fever, migration of pain
- Gastroenteritis — diffuse pain, diarrhea, no focal mass; however, viral illness can coexist with or trigger intussusception [8]
- Meckel's diverticulum — painless rectal bleeding; can also serve as a lead point for intussusception [8]
- Henoch-Schönlein purpura — palpable purpura, arthralgia, abdominal pain; can cause secondary intussusception [8]
- Incarcerated inguinal hernia — inguinal swelling, vomiting, irritability
- Infantile colic — paroxysmal crying in first 3–4 months; diagnosis of exclusion
- Bowel obstruction (adhesive, congenital) — bilious vomiting, distension
- Testicular torsion — abdominal pain can be referred; always examine the genitalia
- Mesenteric adenitis — mimics appendicitis; self-limited [8]
9. Past Medical History
- Prior episodes of intussusception and method of reduction
- History of abdominal surgery (risk for postoperative intussusception)
- Known Meckel's diverticulum, intestinal polyps, or Peutz-Jeghers syndrome [17]
- Celiac disease or cystic fibrosis [18]
- Henoch-Schönlein purpura
- Immunodeficiency (lymphoid hyperplasia)
- Rotavirus vaccination history and timing
10. Physical Exam
- Vital signs: tachycardia (pain, dehydration, or shock); fever is uncommon early and its absence is a predictor of intussusception [13-14]
- Abdomen:
- Sausage-shaped mass in the right upper quadrant or epigastrium (palpable in up to 68% in some series, though often less) [4]
- Right upper quadrant tenderness — a significant predictor (OR 8.2) [14]
- "Dance sign" — emptiness in the right lower quadrant (cecum displaced by intussusceptum)
- Distension and decreased bowel sounds suggest obstruction
- Guarding/rigidity suggest peritonitis → surgical emergency
- Rectal exam: currant jelly stool or guaiac-positive stool — important and frequently positive [6]
- General: assess hydration status, mental status (lethargy is a red flag), and overall appearance (well vs toxic)
- Skin: check for purpura (HSP)
- Inguinal region: rule out incarcerated hernia
11. Lab Studies
- Labs are not diagnostic for intussusception but help assess severity and rule out complications:
- CBC: leukocytosis may indicate infection, necrosis, or stress response
- BMP/electrolytes: assess dehydration, metabolic derangements from vomiting
- CRP: elevated levels correlate with disease severity and distinguish treatment groups (enema reduction vs surgical reduction vs resection) [20]
- Lactate: elevated levels may suggest bowel ischemia
- Type and screen: if surgery is anticipated
- Stool guaiac: frequently positive; blood in stool is a clinical predictor [5-6]
- Emerging biomarkers (WBC ratios, D-dimer, I-FABP) show promise for predicting bowel necrosis and need for surgery but are not yet standard [21]
12. Imaging
- Ultrasound (first-line): the diagnostic modality of choice per ACR Appropriateness Criteria [1]
- Pooled sensitivity 94–97%, specificity 96–97% [1]
- Classic findings: "target sign" (concentric rings on transverse view), "pseudokidney sign" (longitudinal view) [8][22]
- Assess for trapped peritoneal fluid, absence of blood flow on Doppler (ischemia indicators), and lead points [22]
- POCUS has similar diagnostic performance and can expedite diagnosis [23-24]
- Plain abdominal radiograph: sensitivity only ~48–62%, specificity ~21–87% [1][25]
- Useful to evaluate for bowel obstruction (air-fluid levels, dilated loops) or free air (perforation)
- Absence of air in the ascending colon is suggestive but not diagnostic [5]
- Bowel obstruction on radiograph predicts lower enema success and higher resection rates [1]
- Fluoroscopic contrast enema: largely replaced by US for diagnosis; now reserved for therapeutic reduction or when US is nondiagnostic [1]
- CT: rarely indicated in pediatric intussusception; may be useful in older children or adults to evaluate for lead points or alternative diagnoses
13. Special Tests
- Point-of-care ultrasound (POCUS): LR(+) 19.7, LR(−) 0.10 — the highest diagnostic accuracy among bedside tools [24]
- Clinical prediction model (Suh et al.): absence of fever (1 pt), intermittent pain/irritability (1 pt), absence of diarrhea (2 pts), RUQ tenderness (2 pts) — score ≥1 achieves 100% sensitivity and NPV [14]
- Recurrence prediction score (Ding et al.): transverse colon location, prior intussusception, target sign >35 mm, peritoneal effusion, sonographic enteritis — score ≥3 optimally predicts early recurrence [26]
- Technetium-99m pertechnetate scan: for suspected Meckel's diverticulum as a lead point (50% sensitivity in one series) [17]
14. ECG
- ECG is not routinely indicated in intussusception
- Consider if the child presents with unexplained lethargy or altered mental status to rule out cardiac causes
- Obtain if hemodynamically unstable to assess for arrhythmia secondary to electrolyte derangements (from prolonged vomiting/dehydration)
15. Assessment
- Ileocolic intussusception is a pediatric emergency — delay in treatment is directly associated with increased morbidity and mortality [1-2]
- The classic triad is present in <5–20% of cases; physicians correctly diagnose intussusception at the initial encounter in less than half of cases [7]
- Typical presentation: intermittent colicky abdominal pain with pain-free intervals, nonbilious vomiting, and eventually bloody stools
- Atypical presentations (especially in young infants): lethargy, altered mental status, irritability without obvious abdominal complaints [2]
- Severity stratification:
- Uncomplicated: hemodynamically stable, no peritonitis, no perforation → enema reduction
- Complicated: peritonitis, perforation, hemodynamic instability, suspected lead point → surgical intervention [2]
- Complications: bowel obstruction, ischemia, necrosis, perforation, sepsis, death (case fatality <1% in high-resource settings, up to 9–30% in low-resource settings) [1][10]
16. Treatment Plan
Initial stabilization
- IV access, fluid resuscitation, NPO status
- Analgesia as needed; pain management does not impair diagnosis [8]
- Pediatric surgery consultation early
Nonoperative reduction (first-line for stable patients without perforation):
- Pneumatic (air) enema — combined success rate ~83%; or hydrostatic (saline/contrast) enema — success rate ~70–96% [25][27]
- Performed under fluoroscopic or ultrasound guidance [28]
- Air enema has been shown to be superior to liquid enema for successful reduction [7][25]
- Perforation risk during reduction is <1% [10]
- Sedation is used in only ~7% of US cases; some evidence suggests it may improve success rates [10]
Operative intervention — indications
- Hemodynamic instability or peritonitis [2]
- Evidence of perforation (free air)
- Failed enema reduction
- Suspected pathologic lead point [2]
- Options: laparotomy with manual reduction, laparoscopic reduction, or bowel resection if necrosis is present [7]
Post-reduction
- Initiate clear fluids 2 hours after successful reduction [11]
- Monitor for recurrence of symptoms
17. Disposition
Discharge criteria (after successful nonoperative reduction):
- Tolerating clear fluids/feeds without vomiting [2][11]
- Asymptomatic (no recurrence of pain, irritability, or bloody stools)
- Reliable caregivers with clear return precautions
- Observation period of 4–6 hours post-reduction is supported by multiple studies as safe [12][29]
- Early discharge protocols reduce LOS from ~20–24 hours to ~5–9 hours without increased recurrence [12][29]
Admission criteria
- Failed enema reduction requiring surgery
- Persistent symptoms post-reduction (ongoing pain, vomiting)
- Hemodynamic instability or concern for complications
- Unreliable follow-up or social concerns
- Recurrence within 48 hours of initial reduction may warrant admission [30]
Specialist consultation triggers
- Pediatric surgery: all confirmed cases of ileocolic intussusception
- Pediatric radiology: for enema reduction
- Children >5 years — higher likelihood of pathologic lead point (up to 50%); consider early surgical consultation and evaluation for lead point [19]
18. Follow Up / Return Precautions
- Recurrence rate: overall ~8–13% after enema reduction; within 48 hours ~2–5%. Median time to recurrence is ~4 days. A recent multinational study found 8.9% overall recurrence, with re-reduction success rates of 84–94%. [15-16][30]
- Return precautions — instruct caregivers to return immediately for:
- Recurrence of intermittent abdominal pain, crying episodes, or drawing up of legs
- Vomiting
- Bloody or currant jelly stools
- Lethargy or decreased responsiveness
- Fever
- Abdominal distension
- Follow-up: PCP follow-up within 24–48 hours post-discharge
- Expected course: most children recover rapidly after successful reduction; recurrences are usually amenable to repeat enema reduction [15][30]
- In children with recurrent intussusception (≥3 episodes), evaluation for a pathologic lead point should be considered [17]
References
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2. High Risk and Low Incidence Diseases: Pediatric Intussusception. — Long B, Easter J, Koyfman A. The American Journal of Emergency Medicine. 2025.
3. Comparison of Clinical Features of Intussusception in Terms of Age and Duration of Symptoms. — Acer-Demir T, Güney LH, Fakioğlu E, Gültekingil A. Pediatric Emergency Care. 2023.
4. Epidemiology, Clinical Characteristics, and Treatment of Children With Acute Intussusception: A Case Series. — Li Y, Zhou Q, Liu C, et al. BMC Pediatrics. 2023.
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6. Intussusception. — Winslow BT, Westfall JM, Nicholas RA. American Family Physician. 1996.
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8. Acute Abdominal Pain in Children: Evaluation and Management. — Buel KL, Wilcox J, Mingo PT. American Family Physician. 2024.
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10. Sedation and Analgesia for Reduction of Pediatric Ileocolic Intussusception. — Poonai N, Cohen DM, MacDowell D, et al. JAMA Network Open. 2023.
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