Figure 13a. Local lymphadenopathy due to appendicitis. (a) CT image of a 28-year-old woman with acute appendicitis shows a thickened appendix (long arrow). Lymph nodes are present in the mesentery of the right lower quadrant (arrowhead) along with stranding of the mesenteric fat (short arrow), which reflects the inflammatory process. (b) CT image of a 24-year-old woman with acute appendicitis shows multiple lymph nodes in the mesentery of the right lower quadrant (arrowheads).