RT Book, Section A1 Doherty, Gerard M. SR Print(0) ID 58094962 T1 Middle Lobe Syndrome T2 Quick Answers Surgery YR 2010 FD 2010 PB The McGraw-Hill Companies PP New York, NY SN LK accesssurgery.mhmedical.com/content.aspx?aid=58094962 RD 2024/04/20 AB • Relapsing lateral pneumonia of right middle pulmonary lobe (RML) caused by intermittent obstruction• Obstruction most often extrinsic• Consider diagnosis with repeated right-sided pneumonia• May be caused by compression/erosion of bronchus by adjacent diseased lymph nodes• Poor natural drainage and lack of collateral ventilation explain frequency of involvement of RML