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Fig. 7. —34-year-old man with enteric intussusception (CT stage 4, pathologic stage 4). CT scan shows gas and fluid collection making air-fluid levels (arrowheads) in space surrounded by thick bowel wall complex. Note air-fluid levels are extraluminal, whereas they resemble intraluminal contents. Hypodense layer (arrows) is also shown in thick bowel wall complex. Small intestine that had developed gangrene was resected.