• The clinical and ultrasonographic features were compared between SI and PI. • The age, location, diameter and length of intussusception, and intestinal dilation were distinguishing features. • The causes of SI were found to be polyps, intestinal duplication, lymphoma, and Meckel's diverticulum. • Ultrasound can be used as an important method to diagnose SI. • Demonstration and confirmation of PLP are vital to diagnosing SI.
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