Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + • 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 +++ Symptoms and Signs + • Repeated right-sided pneumonias +++ Rule Out + • Other causes of obstruction (neoplasm, foreign body) + • Bronchoscopy to rule out endobronchial tumors and foreign bodies + • Intensive medical therapy usually adequate treatment +++ Surgery + • RML lobectomy +++ Indications + • Bronchiectasis• Fibrosis of RML• RML abscess• Intractable recurrent pneumonia• Suspicion of neoplasm +++ References ++Ring-Mrozik E et al. Clinical findings in middle lobe syndrome and other processes of pulmonary shrinkage in children (atelectasis syndrome). Eur J Pediatr Surg. 1991;1:266. [PubMed: 1747357] Your Access profile is currently affiliated with '[InstitutionA]' and is in the process of switching affiliations to '[InstitutionB]'. Please click ‘Continue’ to continue the affiliation switch, otherwise click ‘Cancel’ to cancel signing in. Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Username Error: Please enter User Name Password Error: Please enter Password Forgot Password? Forgot Username? Sign in via OpenAthens Sign in via Shibboleth