Sonography for appendicitis: Nonvisualization of the appendix is an indication for active clinical observation rather than direct referral for computed tomography

Journal of Clinical Ultrasound, 06/08/2012

Patients with nonvisualization of the appendix on ultrasound (US), but otherwise normal scans, are at significantly lower risk for appendicitis, either perforated or nonperforated. Active clinical observation should be considered in these patients, rather than direct referral for CT.

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