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Difficulty: HardPediatric Gastrointestinal Disorders

A 4-year-old boy is brought to the pediatric emergency department by his parents due to recurrent episodes of severe abdominal pain that started 12 hours ago. During the episodes, he cries inconsolably and pulls his knees to his chest; between episodes, he appears exhausted and lethargic. He has had two episodes of bilious emesis. His last bowel movement consisted of dark red, gelatinous stool. Temperature is 37.2°C (99.0°F), heart rate is 125/min, blood pressure is 95/60 mm Hg, and respiratory rate is 24/min. Physical examination reveals a palpable, sausage-shaped mass in the right middle quadrant. An abdominal ultrasound demonstrates a "target sign." An ultrasound-guided hydrostatic enema is performed, successfully reducing the obstruction. A detailed post-reduction ultrasound identifies a 3.5-cm blind-ending tubular structure protruding from the antimesenteric border of the distal ileum. The patient is now pain-free and resting comfortably. Which of the following is the most appropriate next step in management?

  1. A
    Technetium-99m pertechnetate scintigraphy
  2. Laparoscopic resection of the intestinal anomalyAnswer
  3. C
    Hospital admission for clinical observation alone
  4. D
    Colonoscopy with evaluation of the terminal ileum
  5. E
    Initiation of empiric broad-spectrum antibiotics

Answer

Laparoscopic resection of the intestinal anomaly
This patient presented with classic features of intussusception, which was successfully reduced. Crucially, the post-reduction ultrasound identified a blind-ending tubular structure on the antimesenteric border of the ileum, which is the pathognomonic anatomic description of a Meckel diverticulum. In children older than 2 years, intussusception is frequently caused by a pathological lead point (e.g., Meckel diverticulum, polyp, lymphoma). When a structural lead point is definitively visualized, standard management dictates surgical resection of the anomaly. Leaving a symptomatic Meckel diverticulum in situ carries an extremely high risk of recurrent intussusception, as well as risks for other complications like painless lower gastrointestinal hemorrhage or diverticulitis.

Step-by-Step Solution

1
Diagnose the initial acute presentation based on clinical signs and imaging.
The combination of colicky abdominal pain, currant jelly stool, a palpable abdominal mass, and an ultrasound "target sign" confirms the diagnosis of intussusception.
Recognizing the acute pediatric emergency dictates the immediate therapeutic intervention (hydrostatic enema).
2
Analyze the post-reduction ultrasound findings and patient demographics.
A 3.5-cm tubular structure on the antimesenteric border of the ileum in a 4-year-old strongly indicates a Meckel diverticulum acting as a pathological lead point.
Intussusception in children older than 2 years carries a much higher probability of being driven by a structural anomaly rather than being idiopathic.
3
Determine the definitive management for the identified underlying pathology.
Surgical resection (laparoscopic or open) of the Meckel diverticulum is indicated.
Leaving a symptomatic pathological lead point in place results in an unacceptably high risk of recurrent intussusception, bleeding, or obstruction.

Key Concept

While idiopathic intussusception is managed with non-operative enema reduction and observation, intussusception caused by a definitively identified pathological lead point (such as a Meckel diverticulum) requires surgical resection to prevent recurrence.
Estimated Time:1m 30s
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Topics

Pediatric Gastrointestinal Disorders

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