Intussusception

Abstract

RADIOLOGY FINDINGS An abdominal ultrasound reveals a characteristic target sign in the transverse plane (concentric rings formed by multiple layers of bowel wall) in the right lower quadrant compatible with an ileocolic intussusception (Fig. 1). The patient subsequently underwent single-contrast water-soluble reduction enema, which revealed an intraluminal filling defect (M) in the proximal ascending colon (Fig. 2A) compatible with an intussusceptum, which was successfully reduced by the contrast column to the level of the cecum, allowing reflux of contrast into the small bowel. However, a masslike filling defect (asterisk) persisted along the medial aspect of the cecum (Fig. 2B). A targeted ultrasound performed after the reduction enema confirmed successful reduction of the intussusception, with fluid seen traversing a thickened, edematous ileocecal valve (arrows; Fig. 3), which accounts for persistence of a