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EM TopicsPaediatric abdominal emergencies

EM · Paediatric abdominal emergencies

Paediatric abdominal emergencies — intussusception, volvulus, appendicitis and pyloric stenosis

Also known as Intussusception · Midgut volvulus · Malrotation · Paediatric appendicitis · Infantile hypertrophic pyloric stenosis · The acute abdomen in children

Paediatric abdominal emergencies — the four surgical conditions an ACEM Fellow must distinguish at the bedside: intussusception (3 months to 2 years, intermittent colicky pain with drawing up of the legs, a palpable sausage-shaped RUQ mass and redcurrant-jelly stool as a late sign, ultrasound target/donut sign, pneumatic or ultrasound-guided enema reduction with 80 to 90 per cent success and approximately 10 per cent recurrence), midgut volvulus from malrotation (bilious vomiting in the newborn and infant, never normal, upper GI contrast or ultrasound whirlpool sign, the time-critical Ladd procedure), atypical paediatric appendicitis (diffuse pain and diarrhoea in the under-5, over 50 per cent perforation at presentation, the Samuel Pediatric Appendicitis Score reproduced, ultrasound first), and infantile hypertrophic pyloric stenosis (projectile non-bilious vomiting at 3 to 6 weeks, palpable olive, hypochloraemic hypokalaemic metabolic alkalosis with paradoxical aciduria, correct chemistry before Ramstedt pyloromyotomy). Common management thread — weight-based 0.9 per cent saline plus KCl, nasogastric decompression, surgical referral — distinguished from the medical mimics of constipation, UTI and mesenteric adenitis. ACEM-primary, globally tagged.

medium11 referencesUpdated 26 July 202630 min readVerification in progress

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Target exams

ACEMFRCEMABEMFRCPCCCFPEMEBEEM

Red flags

  • Bilious vomiting in the newborn or infant is malrotation with midgut volvulus until proven otherwise — a normal abdominal X-ray does not exclude it, and delay converts to short-gut syndrome within hours
  • Redcurrant-jelly stool is a LATE sign of intussusception — its absence does not exclude the diagnosis and waiting for it ischaemic bowel is a fatal error
  • An infant with pyloric stenosis must have the alkalosis corrected before surgery — operate on an alkalotic, hypokalaemic child and you court postoperative apnoea and arrhythmia
  • Appendicitis in the child under five presents atypically — diffuse pain, diarrhoea, refusal to walk — and over half have perforated at presentation
  • Never anchor on gastroenteritis in a child with bilious or persistent vomiting and colicky pain — intussusception and volvulus kill the child sent home as a stomach bug
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Related topics

  • Acute appendicitis
  • Acute abdominal pain — the emergency department approach
  • The sick child and paediatric resuscitation
  • Paediatric sepsis and septic shock (the septic child in the emergency department)
  • Paediatric fever and serious bacterial illness (the febrile child in the emergency department)
  • Neonatal emergencies (the sick neonate in the emergency department)
  • Bowel obstruction
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Your progress

Saved on this device.

Practise this topic8 MCQs with explanations

Target exams

ACEMFRCEMABEMFRCPCCCFPEMEBEEM

Red flags

  • Bilious vomiting in the newborn or infant is malrotation with midgut volvulus until proven otherwise — a normal abdominal X-ray does not exclude it, and delay converts to short-gut syndrome within hours
  • Redcurrant-jelly stool is a LATE sign of intussusception — its absence does not exclude the diagnosis and waiting for it ischaemic bowel is a fatal error
  • An infant with pyloric stenosis must have the alkalosis corrected before surgery — operate on an alkalotic, hypokalaemic child and you court postoperative apnoea and arrhythmia
  • Appendicitis in the child under five presents atypically — diffuse pain, diarrhoea, refusal to walk — and over half have perforated at presentation
  • Never anchor on gastroenteritis in a child with bilious or persistent vomiting and colicky pain — intussusception and volvulus kill the child sent home as a stomach bug
The one-line answerThe paediatric acute abdomen maps to age. Four surgical conditions dominate and each owns a narrow window: midgut volvulus in the newborn with bilious vomiting — a surgical emergency measured in hours, never normal, and a normal X-ray excludes nothing; infantile hypertrophic pyloric stenosis at three to six weeks with projectile non-bilious vomiting — a metabolic, not a surgical, emergency, so correct the hypochloraemic hypokalaemic alkalosis before the Ramstedt pyloromyotomy; intussusception at three months to two years with intermittent colicky screaming and drawing up of the legs — ultrasound target sign, pneumatic enema reduction; and acute appendicitis, the commonest surgical emergency over two but a deceptive, frequently perforated diagnosis under five. Estimate the weight before any drug, image with ultrasound first, examine the scrotum in every boy and run a pregnancy test in every girl — and never anchor on gastroenteritis in the vomiting, colicky infant.
[1]

Meet the patient

A nine-month-old, previously well boy arrives with 12 hours of intermittent screaming attacks: every 20 minutes he turns pale and diaphoretic, draws his knees hard to his chest, and vomits, then slumps listless between episodes. Between attacks you feel a firm sausage-shaped mass in the right upper quadrant and an emptiness in the right iliac fossa. The mother reports one bloody, mucus-stained nappy. The registrar wants to call it gastroenteritis and send him home.[1]

Two findings stop the fatal assumption: the intermittent colicky screaming with drawing up of the legs, and the sausage mass with right-iliac-fossa emptiness (Dance sign). Together they are intussusception until the ultrasound says otherwise — and the classic triad of pain, vomiting and redcurrant-jelly stool is present in fewer than half at presentation, so you never wait for the stool.[1]

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References11ShowHide
  1. [1]Hwang J, Yoon HM, Kim PH, Jung AY, Lee JS, Cho YA. Current diagnosis and image-guided reduction for intussusception in children Clin Exp Pediatr, 2023.PMID 35798026
  2. [2]Samuel M. Pediatric appendicitis score J Pediatr Surg, 2002.PMID 12037754
  3. [3]Rich BS, Dolgin SE. Hypertrophic Pyloric Stenosis Pediatr Rev, 2021.PMID 34599053
  4. [4]Nguyen HN, El-Ali AM, Van Tassel D, et al. Diagnostic Performance of Ultrasound for Diagnosing Midgut Malrotation and Volvulus in Children: A Multiinstitutional Retrospective Review AJR Am J Roentgenol, 2025.PMID 40499019
  5. [5]Filion L, Beaunoyer M, Miron MC, et al. Infant malrotation with midgut volvulus: A retrospective review of clinical presentation and delays in care at a Canadian tertiary paediatric centre Paediatr Child Health, 2025.PMID 41049711
  6. [6]Brown RL, Azizkhan RG. Gastrointestinal bleeding in infants and children: Meckel's diverticulum and intestinal duplication Semin Pediatr Surg, 1999.PMID 10573430
  7. [7]Qin KR, Qu LG. Diagnosing with a TWIST: Systematic Review and Meta-Analysis of a Testicular Torsion Risk Score J Urol, 2022.PMID 35238603
  8. [8]Scheier E. Diagnosis and Management of Pediatric Ovarian Torsion in the Emergency Department: Current Insights Open Access Emerg Med, 2022.PMID 35770141
  9. [9]Abu-El-Haija M, Kumar S, Szabo F, et al. Classification of Acute Pancreatitis in the Pediatric Population: Clinical Report From the NASPGHAN Pancreas Committee J Pediatr Gastroenterol Nutr, 2017.PMID 28333771
  10. [10]Helbling R, Conficconi E, Wyttenbach M, et al. Acute Nonspecific Mesenteric Lymphadenitis: More Than No Need for Surgery Biomed Res Int, 2017.PMID 28261620
  11. [11]Abdulhai SA, Glenn IC, Ponsky TA. Incarcerated Pediatric Hernias Surg Clin North Am, 2017.PMID 27894423

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Related topics

  • Acute appendicitis
  • Acute abdominal pain — the emergency department approach
  • The sick child and paediatric resuscitation
  • Paediatric sepsis and septic shock (the septic child in the emergency department)
  • Paediatric fever and serious bacterial illness (the febrile child in the emergency department)
  • Neonatal emergencies (the sick neonate in the emergency department)
  • Bowel obstruction