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Transverse ultrasonographic section of an ileocolic intussusception in a cat (case 6), showing a target-like mass consisting of multiple hyperechoic and hypoechoic concentric rings surrounding a hyperechoic centre (c) and part of small intestine (si). Anechoic areas in the hyperechoic centre represent small vessels and dilated lymphatics (arrows are pointing at the intussusception's border).
