Juvenile polyps are a rare form of gastrointestinal polyps and are generally diagnosed by colonoscopy or barium enema. In this article, we describe the case of a 3-year-old girl with a large juvenile polyp that was diagnosed by abdominal ultrasound. Ultrasound examination is necessary for children who pass dark red bloody stools either with or without abdominal pain. In addition, mechanical bowel preparation before ultrasonic testing is helpful to enable the detection of intraluminal lesions.
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