CASE 180

History: A 23-year-old woman presents with abdominal pain and diarrhea.

1. What should be included in the differential diagnosis of the imaging finding shown in Figure A? (Choose all that apply.)

A. Giardiasis

B. Celiac disease

C. Intussusception

D. Crohn’s disease

E. Yersinia enteritis

2. In this case, the thickened ileum has three layers with a middle low-attenuation layer. What is the name of this sign?

A. String sign

B. Creeping fat

C. Fat halo sign

D. Intramural tract

3. Which of the following statements regarding the CT halo sign is true?

A. The lucent layer is due to widening of the submucosa.

B. Intravenous contrast medium is required to render the lucent layer visible.

C. Halo sign of the colon is most likely due to Crohn’s disease.

D. Halo sign of the terminal ileum is diagnostic of Crohn’s disease.

4

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