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Computerized tomography (CT) scan. In patients who are not pregnant, a CT scan (a type of X-ray study) of the area of the appendix is useful in diagnosing appendicitis and peri-appendiceal abscesses as well as in excluding other diseases inside the abdomen and pelvis that can mimic appendicitis.
Diagnosing appendicitis can be tricky. Appendicitis symptoms are frequently vague or extremely similar to other ailments, including gallbladder problems, bladder or urinary tract infection, Crohn's disease, gastritis, intestinal infection, and ovary problems.