Author(s): Holt S, Samuel E
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Abstract Gray scale ultrasound examination of two patients with abdominal space-occupying lesions demonstrated characteristic ring shadows on longitudinal scans. In one case a multiple concentric ring shadow resulted from an ileocolic intussusception, and in the other a "bull's eye" image was due to an infiltrating carcinoma of the pyloric antrum. A study of these patients confirms the suspicion  that there is a characteristic ultrasonic appearance of intussusception in bowel loops.
This article was published in Gastrointest Radiol
and referenced in Journal of Clinical Case Reports