Fluid and air collection. A coronal-reformatted CT image of a 54-year-old woman presenting with right lower abdominal pain and fever for 20 h, elevated white blood cell counts (18,060 cells/mm3) and neutrophilia (92.2% neutrophils) shows an extraluminal air bubbles mixed with fluid and enteric content (arrows) inferior to an inflamed appendix. Note moderate-to-severe periappendiceal fat stranding with nearby fluid-filled nondilated small bowel loops. Perforated appendicitis was confirmed at surgery and histopathology