TY - JOUR T1 - For questions on page <a href="pending:yes" l:rel="in-this-issue" l:ref-type="doi" l:ref="10.1136/emj.2009.080697">629</a> JF - Emergency Medicine Journal JO - Emerg Med J SP - 683 LP - 683 DO - 10.1136/emj.2009.080903 VL - 26 IS - 9 A2 - , Y1 - 2009/09/01 UR - http://emj.bmj.com/content/26/9/683.abstract N2 - False. By definition primary spontaneous pneumothoraces occur in patients without clinically apparent underlying lung disease, and are thought to occur secondary to rupture of pleurally based blebs.True, with a male to female ratio of approximately 6 to 1.1 2False. A 2007 Cochrane review of the subject concluded that the best evidence suggests there is no … ER -