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(A) Transverse ultrasonographic section of an intussusception in a cat with intestinal lymphoma that was part of the intussusception (case 1). An isoechoic ring around a C-shaped hyperechoic centre is depicted (arrows are pointing at the ring's periphery). (B) Longitudinal section of the same case showing an ovoid mass with no clear periphery margins, consisting of an outer hypoechoic rim around a hyperechoic centre.
