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Department of Diagnostic Radiology, Hadassah University Hospital, Hebrew University, Jerusalem, Israel.
Computed tomographic (CT) changes of intussusception include the early target mass with fascial planes around the mass retained; with progress and bowel wall thickening, the characteristic mass with layering effect occurs (i.e., areas of high density with curvilinear low-density zones). Traction on the associated mesenteric vasculature may be noted. Scattered air-fluid levels indicate the associated presence of bowel obstruction. As edema of the bowel progresses, the layering effect is obscured, and the compromised bowel assumes an amorphous shape surrounded by intraperitoneal fluid. The presence of intramural air is indicative of vascular compromise of the intussuscepting bowel.
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