Target sign (intussusception)

Last revised by Calum Worsley on 25 Jan 2024

The target sign of intestinal intussusception, also known as the doughnut sign or bull's eye sign.

The appearance is generated by concentric alternating echogenic and hypoechoic bands. The echogenic bands are formed by the serosa and submucosa either side of the hypoechoic muscularis propria 1.

See also

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