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Fig. 3B. —76-year-old woman admitted for first episode of acute diverticulitis. She underwent nonoperative treatment with IV antibiotics. Her general condition improved initially, but she relapsed 8 days after admission. She underwent sigmoidectomy 3 months later. Transverse CT scan obtained 5 cm above A shows pocket of extraintestinal gas ( 5 mm in diameter) (arrow) in infiltrated fat (arrowheads).