Intussusception is the most common cause of intestinal obstruction in children aged 3 months to 5 years, with a peak incidence at 6–7 months of age (~62 per 100,000). [1-2] It occurs when one segment of bowel telescopes into an adjacent segment (most commonly ileocolic), leading to edema, obstruction, ischemia, and potentially necrosis and perforation if untreated. Approximately 75% of cases are idiopathic, with 10–25% associated with a pathologic lead point. [1-2]
1. History
- Intermittent, colicky abdominal pain — the most common symptom (84–95%); episodes of severe pain with pain-free intervals [1][3-4]
- Vomiting — present in ~66–71% of cases; typically nonbilious early; bilious vomiting suggests obstruction and predicts enema failure [1][4-5]
- Bloody or "currant jelly" stools — present in 6–32% of cases; more common with prolonged symptoms (>12 h) and in infants <1 year [3-4][6]
- Irritability/inconsolable crying — especially in preverbal infants; may be the only presenting complaint [4][6]
- Timing: Ask about symptom duration (>24 h associated with higher reduction failure), episodic nature, and symptom-free intervals [7]
- Triggers: Recent viral illness, URI, or gastroenteritis; recent rotavirus vaccination [3][8]
- Important negatives: Absence of fever and absence of diarrhea are actually predictive of intussusception (vs. gastroenteritis) [9]
2. Alarm Features
- Bilious vomiting — suggests bowel obstruction; associated with higher enema failure rates [5]
- Altered mental status or lethargy — atypical but well-recognized presentation, especially in younger infants; can be the sole presenting feature [1]
- Signs of peritonitis — guarding, rigidity, rebound tenderness → suggests perforation or necrosis; contraindication to enema reduction [1]
- Hemodynamic instability — tachycardia, hypotension, poor perfusion → suggests shock from bowel compromise
- Prolonged symptom duration >24–48 h — associated with increased risk of reduction failure, bowel necrosis, and need for surgery [4][7]
- Currant jelly stool — a late finding suggesting mucosal ischemia
- Palpable abdominal mass with distension — suggests advanced intussusception
3. Medications
- IV fluid resuscitation — NPO status and fluid replacement are first-line
- Analgesics — pain management is important; opioids may be used but only 7% of children in the US receive sedation during reduction [10]
- Dexamethasone — evidence from a Cochrane review suggests steroids may reduce recurrence rates after reduction [11]
- Glucagon — used by 10–21% of practitioners as an antispasmodic adjuvant during reduction, but evidence does not support improved reduction rates [11]
- Antibiotics — consider if peritonitis, perforation, or sepsis is suspected; routine use is not standard [11]
- Contraindicated: Avoid prokinetics or anything that increases bowel motility in the acute setting
4. Diet
- NPO — maintain nothing by mouth upon presentation in anticipation of enema reduction or surgery
- Post-reduction: Clear liquids first; advance to regular diet as tolerated. Ability to tolerate oral fluids is a key discharge criterion [1][3]
- Same-day discharge after oral feeding toleration has been shown to be safe [3]
5. Review of Systems
- GI: Abdominal pain pattern (intermittent vs. constant), vomiting (bilious vs. nonbilious), stool character (bloody, mucoid, currant jelly), last bowel movement, diarrhea
- Neuro: Lethargy, altered mental status, irritability, decreased responsiveness [1]
- Constitutional: Fever (present in some cases; absence of fever actually increases suspicion for intussusception) [9]
- GU: Decreased urine output (dehydration assessment)
- Respiratory: Recent URI symptoms (associated viral prodrome)
6. Collateral History and Family History
- Caregiver observations: Episodic drawing up of legs, inconsolable crying episodes, refusal to feed
- Recent illness: Viral URI or gastroenteritis in the preceding 1–2 weeks is common
- Vaccination history: Rotavirus vaccine — small increased risk in the 1–7 days post-vaccination (particularly first dose) [3]
- Prior episodes: History of previous intussusception — recurrence rate is 3.7–16.8% after nonoperative reduction [8][12]
- Family history: No strong hereditary pattern, but male sex is a risk factor (M:F ratio ~2:1) [1][3]
7. Risk Factors
- Age 3 months to 5 years (peak 5–9 months) [1-2]
- Male sex — ~60–68% of cases [3][8]
- Recent viral illness or URI (lymphoid hyperplasia as a lead point)
- Rotavirus vaccination — small temporal association
- Pathologic lead points (more common in children >2 years): Meckel's diverticulum, polyps, lymphoma, duplication cysts, Henoch-Schönlein purpura [2][7]
- Prior intussusception — males and younger infants have higher recurrence risk [13]
- Cystic fibrosis, celiac disease, and conditions causing bowel wall thickening
8. Differential Diagnosis
- Malrotation with midgut volvulus — bilious vomiting, surgical emergency; upper GI series is diagnostic [14]
- Appendicitis — more common in older children; persistent (not intermittent) RLQ pain
- Meckel's diverticulum — painless rectal bleeding; can also serve as a lead point for intussusception [14]
- Gastroenteritis — diarrhea and vomiting but typically with fever; pain is diffuse and not episodic
- Incarcerated inguinal hernia — examine inguinal regions carefully
- Henoch-Schönlein purpura — colicky abdominal pain with palpable purpura; can cause intussusception [14]
- Necrotizing enterocolitis — in neonates; abdominal distension, bloody stools, unstable vitals [14]
- Infantile colic — diagnosis of exclusion in infants <4 months
- Testicular torsion — in males with irritability; always examine the scrotum
- Mesenteric adenitis — mimics appendicitis; self-limited
9. Past Medical History
- Prior episodes of intussusception and method of reduction
- Known lead point pathology (polyps, Meckel's, lymphoma)
- Cystic fibrosis or celiac disease
- Recent abdominal surgery (postoperative intussusception) [2]
- Henoch-Schönlein purpura or other vasculitis
- Immunodeficiency (lymphoid hyperplasia)
10. Physical Exam
- Vital signs: Tachycardia (pain, dehydration, or shock); fever may or may not be present; hypotension is a late and ominous sign
- Abdominal exam:
- Sausage-shaped mass in the RUQ or epigastrium (palpable in up to 68% in some series, though often less) [8]
- RUQ tenderness — strong predictor (aOR 8.2) [9]
- "Dance sign" — emptiness in the RLQ where the cecum normally resides
- Distension suggests obstruction
- Peritoneal signs (guarding, rigidity) → surgical emergency
- Rectal exam: Currant jelly stool or guaiac-positive stool
- General: Assess hydration status, mental status (lethargy is a red flag), and overall appearance during pain-free intervals (may appear deceptively well) [1]
- Inguinal exam: Rule out incarcerated hernia
11. Lab Studies
- Labs are not required for diagnosis but may be helpful:
- CBC: Leukocytosis may be present; not specific
- BMP/electrolytes: Assess dehydration and electrolyte derangements from vomiting
- Stool guaiac: Occult blood supports the diagnosis
- CRP: May be elevated; nonspecific
- Type and screen: If surgery is anticipated
- Lactate: Consider if concern for bowel ischemia or shock
- Blood culture: If sepsis is suspected
12. Imaging
- First-line: Abdominal ultrasound [1-2][15]
- Sensitivity 94–98%, specificity 96–100% [2][16]
- Classic findings: "Target sign" (concentric rings on transverse view) and "pseudokidney sign" (longitudinal view) [17]
- "Crescent-in-doughnut sign" — mesentery enclosing the entering limb [17]
- Also evaluates for free fluid, lead points, and bowel wall viability
- Point-of-care ultrasound (POCUS): Sensitivity 95%, specificity 98%; comparable to radiology-performed US and can expedite diagnosis [18-19]
- Abdominal radiograph: Sensitivity only ~48–62%; may show soft tissue mass, paucity of gas in RLQ, or signs of obstruction/perforation. Useful to rule out free air before enema reduction [2][20]
- CT: Generally not first-line; consider if lead point is suspected (especially in children >2 years with recurrent episodes) [21]
- When imaging is unnecessary: Transient small-bowel intussusceptions (incidental, <2.5 cm, no symptoms) are usually self-limiting [22]
13. Special Tests
- 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 [9]
- Risk stratification decision tree (Weihmiller et al.): Incorporates abdominal x-ray result, age >5 months, absence of diarrhea, and absence of bilious emesis — sensitivity 97%, NPV 99% [23]
- Recurrence prediction score (Ding et al.): Transverse colon location, prior intussusception, target sign >35 mm, peritoneal effusion, sonographic enteritis — score ≥3 predicts early recurrence (AUC 0.795) [24]
14. ECG
- Not routinely indicated
- Consider if hemodynamically unstable or if procedural sedation is planned for enema reduction
- Rule out arrhythmia in a lethargic infant with unclear etiology
15. Assessment
Intussusception is a pediatric abdominal emergency. The classic triad (intermittent abdominal pain, currant jelly stool, sausage-shaped mass) is present in <10–20% of cases. [4][11] Physicians correctly diagnose intussusception at the initial encounter in less than half of cases. [11] Key clinical pearls:
- Most children present with intermittent abdominal pain and vomiting — the triad is the exception, not the rule
- Atypical presentations (lethargy, altered mental status) are well-described, especially in infants <1 year [1]
- Delay in diagnosis increases the risk of surgical intervention and complications [2][11]
- Complications include bowel obstruction, ischemia, necrosis, perforation, and sepsis
- In high-resource settings, case fatality is <1%; in low-resource settings, mortality can reach 9–30% [2][10]
16. Treatment Plan
Initial stabilization
- IV access, fluid resuscitation, NPO status
- Pain management; consider procedural sedation for reduction
Non-operative reduction (first-line for stable patients without perforation):
- Pneumatic (air) enema — success rate ~83% (fluoroscopy-guided) [20]
- Hydrostatic (saline) enema — success rate ~88–90% (US-guided); meta-analysis suggests UGHR has higher success, shorter reduction time, fewer complications, and lower perforation risk than air enema [25]
- Perforation risk during reduction is <1% [10]
- Reduction success is maintained up to 8 hours from diagnosis without increased complications [26]
- A second or third attempt at enema reduction may be considered if the first attempt fails, as delayed repeat attempts can be successful [1]
Surgical intervention — indications
- Hemodynamic instability or peritonitis [1]
- Evidence of perforation (free air on imaging)
- Failed enema reduction
- Suspected pathologic lead point [1][7]
- Options: Open laparotomy with manual reduction, or laparoscopic reduction (shorter hospitalization) [11]
- Bowel resection if necrosis is found
Adjuncts
- Dexamethasone may reduce recurrence rates [11]
- Surgical consultation should be obtained before enema reduction attempt
17. Disposition
Discharge criteria (after successful non-operative reduction):
- Tolerating clear fluids/oral intake
- Asymptomatic and pain-free
- Reliable caregivers with clear return precautions
- Early discharge (4–6 hours post-reduction) is safe and cost-effective — reduces LOS from ~23 h to ~9 h without increased recurrence [27]
- However, ED-discharged patients have slightly higher odds of return within 48 h compared to admitted patients (aOR 3.43), though re-reduction success rates remain equally high (~84–94%) [28]
Admission criteria
- Failed reduction requiring repeat attempts or surgery
- Hemodynamic instability or peritonitis
- Inability to tolerate oral fluids
- Concern for pathologic lead point
- Unreliable follow-up or social concerns
- Consider admission for infants <1 year or those with risk factors for recurrence [13]
Surgical consultation triggers
- All confirmed ileocolic intussusceptions should have surgical consultation prior to reduction
- Failed enema reduction, perforation, peritonitis, suspected lead point, or recurrent episodes (>4 recurrences → consider CT for lead point, then exploratory laparotomy) [21]
18. Follow Up / Return Precautions
Recurrence
- Overall recurrence rate is 3.7–16.8% after nonoperative reduction [8][12]
- Median time to recurrence is ~4 days; only 1.5% recur within 48 h of discharge [12]
- Risk factors for recurrence: younger age (<1 year), male sex, prior episodes, transverse colon location, target sign >35 mm, peritoneal effusion [13][24]
Return precautions — instruct caregivers to return immediately for:
- Recurrence of episodic abdominal pain, crying, or drawing up of legs
- Vomiting (especially bilious)
- Bloody or currant jelly stools
- Lethargy or decreased responsiveness
- Fever or abdominal distension
- Refusal to eat or drink
Follow-up
- PCP follow-up within 24–48 hours after discharge
- Closer follow-up for infants <1 year and those with risk factors for recurrence
- If >4 recurrences after successful enema reductions, pursue CT to evaluate for a pathologic lead point; if inconclusive, consider exploratory laparotomy [21]
References
1. High Risk and Low Incidence Diseases: Pediatric Intussusception. — Long B, Easter J, Koyfman A. The American Journal of Emergency Medicine. 2025.
2. ACR Appropriateness Criteria® Abdominal Pain-Child. — Expert Panel on Pediatric Imaging, Nguyen HN, Chan SS, et al. Journal of the American College of Radiology : JACR. 2026.
3. Pushing Backwards: Evaluating Effectiveness of Conservative Treatment of Intestinal Intussusception. — Carvalho C, Correia MR, Barros A, et al. Pediatric Emergency Care. 2024.
4. 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.
5. Risk Factors for Failure of Enema Reduction of Intussusception in Children. — Alsinan T, Altokhais T, Alshayeb F, et al. Scientific Reports. 2024.
6. Intussusception: Clinical Presentations and Imaging Characteristics. — Mandeville K, Chien M, Willyerd FA, et al. Pediatric Emergency Care. 2012.
7. Determinants of Ultrasound-Guided Reduction Failure and Pathological Lead Points in Pediatric Intussusception. — Braun Y, Fiegel HC, Rolle U, Theilen TM. Pediatric Surgery International. 2026.
8. Epidemiology, Clinical Characteristics, and Treatment of Children With Acute Intussusception: A Case Series. — Li Y, Zhou Q, Liu C, et al. BMC Pediatrics. 2023.
9. Development of a Clinical-Based Prediction Model for Pediatric Intussusception: A Prospective Observational Study. — Suh D, Lee JH, Oh S, Kwon H, Hwang JE. The Journal of Emergency Medicine. 2025.
10. Sedation and Analgesia for Reduction of Pediatric Ileocolic Intussusception. — Poonai N, Cohen DM, MacDowell D, et al. JAMA Network Open. 2023.
11. Management for Intussusception in Children. — Gluckman S, Karpelowsky J, Webster AC, McGee RG. The Cochrane Database of Systematic Reviews. 2017.
12. Incidence of Recurrent Intussusception in Young Children: A Nationwide Readmissions Analysis. — Ferrantella A, Quinn K, Parreco J, et al. Journal of Pediatric Surgery. 2020.
13. Recurrence of Pediatric Intussusception: A Nationwide Population-Based Descriptive Study in Taiwan. — Chang CY, Chen YY, Lin CH, et al. Medicine. 2023.
14. Acute Abdominal Pain in Children: Evaluation and Management. — Buel KL, Wilcox J, Mingo PT. American Family Physician. 2024.
15. Practical Imaging Strategies for Intussusception in Children. — Plut D, Phillips GS, Johnston PR, Lee EY. AJR. American Journal of Roentgenology. 2020.
16. Ultrasonographic Diagnosis of Intussusception in Children: A Systematic Review and Meta-Analysis. — Li XZ, Wang H, Song J, et al. Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine. 2021.
17. Intussusception: US Findings With Pathologic Correlation--the Crescent-in-Doughnut Sign. — del-Pozo G, Albillos JC, Tejedor D. Radiology. 1996.
18. Diagnostic Accuracy of Point-of-Care Ultrasonography for Intussusception in Children: A Systematic Review and Meta-Analysis. — Lin-Martore M, Firnberg MT, Kohn MA, Kornblith AE, Gottlieb M. The American Journal of Emergency Medicine. 2022.
19. Ultrasound Guidelines: Emergency, Point-of-Care, and Clinical Ultrasound Guidelines in Medicine. — American College of Emergency Physicians (2023). 2023.
20. Comparative Effectiveness of Imaging Modalities for the Diagnosis and Treatment of Intussusception: A Critically Appraised Topic. — Carroll AG, Kavanagh RG, Ni Leidhin C, et al. Academic Radiology. 2017.
21. Clinical Management and Recommendations for Children With More Than Four Episodes of Recurrent Intussusception Following Successful Reduction of Each: An Institutional Review. — Hutchason A, Sura A, Vettikattu N, Goodarzian F. Clinical Radiology. 2020.
22. Evolving Concepts in Ultrasonography of Pediatric Intussusceptions: Unequivocal Differentiation of Ileocolic, Obstructive and Transient Small-Bowel Intussusceptions. — Goel I, Anand R, Choudhury SR, Agarwal S. Ultrasound in Medicine & Biology. 2020.
23. Risk Stratification of Children Being Evaluated for Intussusception. — Weihmiller SN, Buonomo C, Bachur R. Pediatrics. 2011.
24. Predicting Early Recurrence After Hydrostatic Reduction of Pediatric Intussusception: A Nomogram and a Simplified Clinical Score. — Ding Z, Qiang H, Li X, et al. The American Journal of Emergency Medicine. 2026.
25. Air Enema Reduction Versus Hydrostatic Enema Reduction for Intussusceptions in Children: A Systematic Review and Meta-Analysis. — Liu L, Zhang L, Fang Y, et al. PloS One. 2023.
26. Multicenter Analysis of Time Interval to Intussusception Reduction: Success and Complication Rates. — Strubel NA, Barton K, Baran TM, et al. Journal of Pediatric Surgery. 2026.
27. Early Discharge After Nonoperative Management of Intussusception Is Both Safe and Cost-Effective. — Arshad SA, Hebballi NB, Hegde BN, et al. Journal of Pediatric Surgery. 2022.
28. Discharge Strategies Following Successful Ileocolic Intussusception Reduction: Hospitalization vs Emergency Department Observation. — Cohen DM, Helwig S, Poonai N, et al. The Journal of Pediatrics. 2026.