RT Journal Article SR Electronic T1 Crescent sign in abdominal aortic aneurysm JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr-2018-225435 DO 10.1136/bcr-2018-225435 VO 2018 A1 Pooya Iranpour A1 Sara Haseli YR 2018 UL http://casereports.bmj.com/content/2018/bcr-2018-225435.abstract AB