should diagnostic imaging be performed if the clinical presentation is highly suggestive of the disease?
GROUND & AIMS: Our aim was to investigate whether diagnostic imaging is required if the clinical presentation suggests acute appendicitis with high probability. METHODS: On the basis of clinical findings, 350 consecutive patients with clinical suspicion of acute appendicitis were prospectively divided into 3 groups as follows: low, intermediate, and high probability of having appendicitis. All patients then underwent diagnostic ultrasonography. The clinical likelihood of appendicitis and the ultrasonographic results were correlated with the definite diagnoses. RESULTS: In the patients with clinically low probability of having appendicitis, appendicitis was present in 10% (11 of 109 patients), and, in those with intermediate probability, appendicitis was present in 24% (23 of 97 patients). Patients with clinically high probability of having appendicitis had appendicitis in 65% (94 of 144 patients), an alternative diagnosis in 18% (26 of 144 patients), and no specific definitive diagnosi
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