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©2013 UpToDate ® Print Email CT scan acute appendicitis The CT scan was obtained using oral and intravenous contrast from a patient who presented with right lower quadrant abdominal pain. These figures show an inflammed appendix that measures 21 mm in diameter and contains an appendicolith and fluid that is likely purulent. (A) Shows an appendicolith in the appendix using a white arrow. (B) Shows the appendicolith, an overlay of orange to show fluid inside the appendix, and a yellow arrow indicates free fluid. (C) Shows the enlarged appendix and fluid without an overlay. (D) Shows a colored overlay: red circle depicts the enhancing appendiceal wall; orange depicts the intra-appendiceal fluid; yellow depicts the free fluid.