Figure 5b. CT scans in a 29-year-old woman with acute appendicitis. (a, b) Nonenhanced transverse CT scans show the inflamed appendix (arrows) lying within the right lower quadrant. The appendix is enlarged, but no periappendiceal inflammatory soft-tissue stranding is apparent. (c, d) Contrast-enhanced transverse CT scans show a mural stratification enhancement pattern within the thickened appendiceal wall (arrows), a sign that is diagnostic of the presence of inflammation.