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describes invagination of one portion of bowel into the lumen of the adjacent bowel, most commonly around the ileo-caecal region.
6-18/12 old 
Boys>girls (x2)

''Features''
    paroxysmal abdominal colic pain
    during paroxysm the infant will characteristically draw their knees up and turn pale
    vomiting
    blood stained stool - 'red-currant jelly'
    sausage-shaped mass in the abdomen

''Investigation''
    ultrasound is now the investigation of choice and may show a target-like mass

''Management''
    the majority of children can be treated with reduction by air insufflation under radiological control, which is now widely used first-line compared to the traditional barium enema
    if this fails, or the child has signs of peritonitis, surgery is performed