A doctor thinks a patient has an intussusception, in which a part of the intestine slides inside itself like the parts of a collapsible telescope. Which imaging technique is the doctor most likely to use? Explain.

Sonography, or ultrasound, is commonly used to diagnose intussusception. It can show the characteristic appearance of one section of intestine telescoping into another, provides useful detail, and does not expose the patient to ionizing radiation. Fluoroscopy can be used to guide an enema that may treat the condition, but ultrasound is the likely initial imaging choice.

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