Intussusception Diagnosis and Management

Clinical Presentation

Bilious vomiting in an infant indicates obstruction distal to the ampulla of Vater, suggesting a potentially serious condition requiring urgent evaluation, as recommended by the American College of Radiology 1, 2
Crampy, intermittent abdominal pain is often manifested as episodes of inconsolable crying or drawing up of legs in infants with suspected intussusception, according to the American College of Radiology 3
Bloody stools, often described as "currant jelly" stools, indicate mucosal damage and are a concerning feature of intussusception, as noted by the American College of Radiology 3

Progression from initial vomiting to bilious emesis suggests worsening obstruction in infants with suspected intussusception, as indicated by the American College of Radiology 2

Bilious vomiting in any infant should prompt immediate evaluation for possible surgical conditions, including intussusception, as recommended by the American College of Radiology 1, 2

Any infant with bilious vomiting requires prompt evaluation with appropriate imaging, including ultrasound, as recommended by the American College of Radiology 2

The American College of Radiology recommends starting with a simple abdominal radiograph to identify signs of intestinal obstruction, such as dilated loops and air-fluid levels 4
The American College of Radiology guidelines, although primarily focused on newborns, emphasize that the fundamental principles apply to all ages: bilious vomiting is a surgical emergency until proven otherwise, with abdominal radiograph being a crucial initial step 4, 5, 6

The American Academy of Pediatrics and other medical societies imply, through the context of intestinal obstruction management, that immediate consultation with a pediatric surgical team is necessary upon confirmation of bilious vomiting, given the potential for conditions like volvulus to compromise intestinal vascularization and lead to necrosis within hours 4

The American College of Radiology recommends obtaining an abdominal X-ray immediately as the first imaging study, followed by upper GI contrast series if obstruction is confirmed, for infants with suspected intestinal obstruction 7, 8
Plain abdominal X-ray is the appropriate first imaging study to identify signs of intestinal obstruction, including dilated bowel loops, air-fluid levels, and the pattern of gas distribution, as recommended by the American College of Radiology 7

After the initial radiograph, an upper GI series is usually appropriate for infants older than 2 days with bilious vomiting to evaluate for malrotation and midgut volvulus, with a sensitivity of 96% for detecting malrotation 7, 8, 9
The upper GI series directly images the stomach and small bowel, with the most critical finding being abnormal position of the duodenojejunal junction (ligament of Treitz), which indicates malrotation 9

Contrast enema is NOT appropriate for initial evaluation of bilious vomiting in this age group, as it is reserved for suspected distal bowel obstruction 7, 8, 9
Endoscopy has no role in the acute evaluation of intestinal obstruction in infants 7, 8, 9

The condition should not be confused with pyloric stenosis, which presents with non-bilious projectile vomiting in infants 2 weeks to 3 months old and would warrant ultrasound as the initial study 7, 8