Introduction: Contrast-enhanced computed tomography (CECT) is an emergent diagnostic imaging modality to identify the bleeding site and survey the abdominal cavity. The diagnostic utility of CECT for ectopic pregnancy (EP) has not been well-investigated. The objective of this study was to evaluate the characteristics of CECT findings in patients with EP and extract specific findings that could contribute to the identification of implantation sites.
Method: We conducted a retrospective study, reviewing suspected EP cases between April 2015 and March 2018 in our hospital. Clinical symptoms, blood test results, transvaginal sonography findings, and surgical and pathologic findings from the medical records were assessed. CECT images were evaluated by a certified radiologist and gynecologist retrospectively in consensus. The following were selected as positive findings for specific determination of the ectopic implantation site: the ectopic gestational sac, lateralization of the hemoperitoneum around the adnexa on either side, and extravascular leakage of the contrast agent outside the uterine cavity.
Results: CECT was performed in 41 women with an EP. The ectopic implantation site was detectable on CECT in 90.2% (37/41), whereas it was noted in 70.0% (32/41) on transvaginal ultrasonography (TVS). Of nine patients with an EP with an undetectable implantation site on TVS, six were positive for the specific determination of the ectopic implantation site on CECT.
Conclusion: CECT has the potential to predict ectopic implantation sites with high-level sensitivity. As CECT is an urgent diagnostic imaging tool to be used in an emergent setting, it may be a good option for EP diagnosis when the availability of magnetic resonance imaging is limited.
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