Clinical Presentation

A 7-year-old child with right lower quadrant abdominal pain and tenderness, low-grade fever, and anorexia.

(A,B) Two axial computed tomography (CT) images after the oral and intravenous administration of contrast demonstrate inflammatory changes in the right lower quadrant with a dilated, fluid-filled tubular structure that has a thickened and enhancing wall (arrow).

Differential Diagnosis

• Appendicitis: The finding of a dilated appendix with wall thickening, increased enhancement, and surrounding inflammation is typical.

• Mesenteric adenitis: