PT - JOURNAL ARTICLE AU - M A Waheed AU - P Gilligan TI - Congenital absence of the posterior arch of the atlas: a benign anomaly? AID - 10.1136/emj.2009.085993 DP - 2010 Oct 01 TA - Emergency Medicine Journal PG - 803--803 VI - 27 IP - 10 4099 - http://emj.bmj.com/content/27/10/803.short 4100 - http://emj.bmj.com/content/27/10/803.full SO - Emerg Med J2010 Oct 01; 27