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Gas Distribution in Intraabdominal and Pelvic Abscesses on CT Is Associated with Drainability

Gladwin C. Hui1, Joao Amaral1, Derek Stephens2, Eshetu Atenafu2, Philip John1, Michael Temple1, Peter Chait1 and Bairbre Connolly1

1 Division of Image Guided Therapy, Department of Diagnostic Imaging, University of Toronto, Hospital of Sick Children, 555 University Ave., Toronto, ON M5G 1X8, Canada.
2 Population Health Sciences, University of Toronto, Hospital of Sick Children, Toronto, ON, Canada M5G 1X8.



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  		Fig. 1. —16-year-old girl with appendicitis. Axial CT slice (contrast-enhanced) through abdomen shows large abscess on right side, with large air–fluid level (asterisks) (type 1).

 


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  		Fig. 2. —15-year-old boy with appendicitis. Axial CT slice (contrast-enhanced) through pelvis shows large abscess that has superficial bubble (arrowheads) and air–fluid level (asterisks) (type 2).

 


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  		Fig. 3. —11-year-old girl with appendicitis. Axial CT slice (contrast-enhanced) through pelvis shows multiloculated abscess with several superficial bubbles (arrowheads) (type 3).

 


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  		Fig. 4. —4-year-old girl with appendicitis. Axial CT slice (contrast-enhanced) through abdomen shows crescent-shaped abscess on right side, with several deep trapped bubbles (triple arrowheads) and appendicolith (single arrowhead) (type 4).

 


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  		Fig. 5. —10-year-old boy with appendicitis. Axial CT slice (contrast enhanced) through abdomen shows septated abscess (S) on right side with no gas (type 5).

 


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  		Fig. 6. —Schematic representation of five types of collections.

 

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