JOURNAL ARTICLE
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Diagnostic accuracy of pelvic imaging for acute pelvic inflammatory disease in an emergency care setting: a systematic review and meta-analysis.

The aim of this review is to investigate the diagnostic accuracy or performance of contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI) for acute pelvic inflammatory disease (PID) in an emergency care setting. We searched for studies on the diagnostic test accuracy of contrast-enhanced CT or MRI for women of reproductive age with acute abdominal pain using MEDLINE, Embase, Cochrane Central Register of Controlled Trials, International Clinical Trials Registry Platform, and ClinicalTrials.gov. The reference standard was gynecological examinations by gynecologists using standard diagnostic criteria with or without laparoscopy or transcervical endometrial biopsy. Two reviewers undertook screening of records, data extraction, and assessment of the risk of bias in each included study using the Quality Assessment of Diagnostic Accuracy Studies-2 tool. A bivariate model was used for the meta-analysis. Of 2,619 screened studies, three studies investigating contrast-enhanced CT and one study investigating MRI were eligible, including a total 635 patients and with a median prevalence of acute PID of 29%. All of the included studies had a high risk of bias for a reference standard and had some applicability concerns. Contrast-enhanced CT had a pooled sensitivity of 0.79 (95% confidence interval [CI], 0.52-0.93) and specificity of 0.99 (95% CI, 0.94-1.00). Magnetic resonance imaging had a sensitivity of 0.95 (95% CI, 0.76-1.00) and specificity of 0.89 (95% CI, 0.52-1.00). Contrast-enhanced CT might serve as a practical alternative to gynecological examination in the diagnosis of acute PID in an emergency care setting, however, the evidence was uncertain. The evidence on MRI was also very uncertain.

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