Acute appendicitis is the most common cause of acute abdominal pain requiring urgent abdominal surgical intervention. Computed tomography (CT) is the preferred imaging examination for the evaluation of patients due to its high sensitivity and specificity. The appendix is a highly variable organ with many possible configurations of its location. Depending on the position of the appendix, the signs and symptoms of appendicitis may also vary and mimic other surgical conditions. Diagnosing appendicitis requires an understanding of the anatomy of the vermiform appendix, which may vary from patient to patient. This study aims to describe the prevalence of anatomical variations of the vermiform appendix on multidetector CT (MDCT). Methods: A retrospective review of consecutive abdominal CT exams (age ≥ 15) performed over eleven months was done. The final study population consisted of 669 patients, 317 men and 352 women, mean age of 51.85 years ± 16.39 (SD), age range, 15-91 years. A classification system was used to describe the different positions of the appendix apex. Results: The most common location of appendix apex was subcecal in 180 (26.9%), followed by pelvic in 153 (22.9%), midline in 130 (19.4%), retrocecal in 100 (14.9%), postileal in 29 (4.3%), paracecal in 20 (3%), others in 19 (2.8%), antececal in 18 (2.7%), hepatic in 14 (2.1%), preileal in 6 (0.9%). Analysis of relative frequencies of appendix locations in relation to patient gender using a chi-square test showed that the pelvic and post-ileal positions of the appendix were statistically significantly higher in females compared to males (p<0.0001, P=0.0158 respectively). The most common
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