RT Journal Article SR Electronic T1 An unusual cause of pilonidal sinus JF Journal of Accident & Emergency Medicine JO Arch Emerg Med FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 232 OP 232 DO 10.1136/emj.17.3.232 VO 17 IS 3 A1 J P Sloan A1 J Brenchley YR 2000 UL http://emj.bmj.com/content/17/3/232.abstract AB