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. 2012 Jun 28;18(24):3177–3180. doi: 10.3748/wjg.v18.i24.3177

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Colonoscopy and computed tomography of case 1. A: Colonoscopy revealed a large fistula in the right side wall of the rectum; B: Computed tomography revealed a large abscess in the right rectal wall (6 cm × 3 cm × 3 cm in diameter) (arrowheads) and a fistula (arrow); C: After the lavage with 2 liters of saline, a colonoscopy was performed, and the fistula was completely closed using the over-the-scope-clip (OTSC) technique (arrow); D: Computed tomography revealed a remarkable disappearance of the abscess (arrowheads) and showed the OTSC (arrow).