An intussusception is a medical condition in which a part of the intestine has invaginated into another section of intestine; this leads to a bowel obstruction.  In the scout film below, you can see a “target sign” which is usually only visible on CT scan, in this case is visible in the AP image of the abdomen.

mouseover for labels image from anatomybox
This child presented with a 2 day history of crampy abdominal pain.

CT scan of “target sign” (link)

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