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Background: The purpose of this study is to investigate the relevant findings in adult patients admitted to Cabell Huntington Hospital who were diagnosed with acute appendicitis. Methods: Patients who had the postoperative diagnosis of acute appendicitis and a preoperative computed tomography (CT) scan from January 2011 through December 2016 were included in this retrospective chart review. Results: There were 592 patients. A thick, edematous appendix was the most common CT finding in acute appendicitis. The average diameter was 12.6 mm. The wall thickness correlated to the diameter of the appendix ( P < 0.001). For comparison, we reviewed the CT scans of 50 trauma patients who had normal abdominal CT scans. The average diameter of a normal appendix was 4.9 mm (SD 1.139) with a range of 4-7 mm. Interestingly, the admission white blood cell count ( P = 0.0372) as well as the thickness of the appendix ( P < 0.0001) were strongly associated with increased length of stay. Conclusions: An appendiceal diameter greater than 9 mm should be considered abnormal and associated with acute appendicitis. Appendiceal size, white blood cell count, and age correlate with length of stay. Early antibiotics and early surgical intervention may decrease length of stay.