 CT Abdomen and Pelvis With IV Contrast As mentioned from the CT angiography (CTA) abdomen and pelvis without and with intravenous (IV) contrast section below, contrast-enhanced CT scans have not been generally accepted as a first-line screening tool for AAA [13]. Increasing number of abdominal CT scans in most hospitals results in diagnosis of many incidental AAAs. Retrospective review studies of abdominal CT scans done for a variety of reasons showed a prevalence of 2.2% to 5.8% for AAA [14,15]. The American College of Radiology seeks and encourages collaboration with other organizations on the development of the ACR Appropriateness Criteria through representation of such organizations on expert panels. Participation on the expert panel does not necessarily imply endorsement of the final document by individual contributors or their respective organization. Reprint requests to: publications@acr.org Screening for Abdominal Aortic Aneurysm CT Abdomen and Pelvis Without and With IV Contrast Again, as mentioned from the CTA abdomen and pelvis without and with IV contrast section below, contrast- enhanced CT scans have not been generally accepted as a first-line screening tool for AAA [13]. CT Abdomen and Pelvis Without IV Contrast Noncontrast CT can be considered as a screening examination for AAA, which can be especially beneficial in the setting of obesity or poor sonographic window. One study reported that noncontrast CT was superior to ultrasound (US) concerning sensitivity ranging from 83% to 89% depending on the measured plane when compared to US with 57% to 70%, although specificity was high for both studies measuring 98% and 99%, respectively [13]. With modern CT imaging technology, noncontrast CT has been proposed as an alternative screening method to offer more reliable examinations with additional information, including aortic wall calcifications, as well as thoracic and iliac aortic abnormality [13].
Screening for Abdominal Aortic Aneurysm.  CT Abdomen and Pelvis With IV Contrast As mentioned from the CT angiography (CTA) abdomen and pelvis without and with intravenous (IV) contrast section below, contrast-enhanced CT scans have not been generally accepted as a first-line screening tool for AAA [13]. Increasing number of abdominal CT scans in most hospitals results in diagnosis of many incidental AAAs. Retrospective review studies of abdominal CT scans done for a variety of reasons showed a prevalence of 2.2% to 5.8% for AAA [14,15]. The American College of Radiology seeks and encourages collaboration with other organizations on the development of the ACR Appropriateness Criteria through representation of such organizations on expert panels. Participation on the expert panel does not necessarily imply endorsement of the final document by individual contributors or their respective organization. Reprint requests to: publications@acr.org Screening for Abdominal Aortic Aneurysm CT Abdomen and Pelvis Without and With IV Contrast Again, as mentioned from the CTA abdomen and pelvis without and with IV contrast section below, contrast- enhanced CT scans have not been generally accepted as a first-line screening tool for AAA [13]. CT Abdomen and Pelvis Without IV Contrast Noncontrast CT can be considered as a screening examination for AAA, which can be especially beneficial in the setting of obesity or poor sonographic window. One study reported that noncontrast CT was superior to ultrasound (US) concerning sensitivity ranging from 83% to 89% depending on the measured plane when compared to US with 57% to 70%, although specificity was high for both studies measuring 98% and 99%, respectively [13]. With modern CT imaging technology, noncontrast CT has been proposed as an alternative screening method to offer more reliable examinations with additional information, including aortic wall calcifications, as well as thoracic and iliac aortic abnormality [13].