A 68-year-old obese man underwent computed tomographic colonography (CTC) scanning to investigate worsening constipation and lower abdominal discomfort on his left side.Optical colonoscopy was contraindicated because of his comorbidities. A preliminary CTC diagnosis of incarcerated Spigelian hernia was made, based on lateral deviation of thesigmoid colon to the left as well as extrinsic impressions on it, and the central location of the small bowel. Spigelian hernia is a rare form of anterior abdominal wall hernia. CTC can play a role in its diagnosis.

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