Fig. 9.
Periappendiceal air and fluid. Axial CT images of two different patients show extraluminal air within mesoappendix (arrow in a) and extraluminal periappendiceal fluid (arrow in b). The former patient is a 73-year-old man who presents with abdominal pain and fever, slightly elevated white blood cell counts (11,370 cells/mm3) and neutrophilia (88.0% neutrophils). The latter is a 39-year-old-man presenting with right lower abdominal pain for 1 day, elevated white blood cell counts (17,100 cells/mm3) and neutrophilia (86.8% neutrophils). Both have a confirmed diagnosis of perforated appendicitis