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Table 1 Major and minor criteria used in the case definition for the diagnosis of intussusception

From: A multi-country study of intussusception in children under 2 years of age in Latin America: analysis of prospective surveillance data

1. Evidence of intestinal obstruction: Predisposing factors:
I. History of bile-stained vomiting and either Age <1 year and male sex
II. Examination findings of acute abdominal distension and abnormal or absent bowel sounds Abdominal pain
or Vomiting
III. Plain abdominal radiograph showing fluid levels and dilated bowel loops. Lethargy
2. Features of intestinal invagination: One or more of the following: Pallor
I. Abdominal mass Hypovolemic shock;
III. Rectal mass Plain abdominal radiograph showing an abnormal but non-specific bowel gas pattern
IIII. Intestinal prolapse
IV. Plain abdominal radiograph showing a visible intussusceptum or soft tissue mass
V. Abdominal ultrasound showing a visible intussusceptum or soft tissue mass
VI. Abdominal CT scan showing a visible intussusceptum or soft tissue mass.
3. Evidence of intestinal vascular compromise or venous congestion:
I. Passage of blood per rectum
II. Passage of a stool containing “red currant jelly” material
III. Blood detected on rectal examination  
  1. J.E. Bines, K.S. Kohl, J. Forster, et al., Vaccine. 22 (2004) 569–574.