RT Journal Article SR Electronic T1 Outlined psoas muscle shadow JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 738 OP 738 DO 10.1136/emj.2006.041970 VO 24 IS 10 A1 Shih-Hung Tsai A1 Shi-Jye Chu YR 2007 UL http://emj.bmj.com/content/24/10/738.abstract AB