Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF Listen ++ For further information, see CMDT Part 9-17: Right Middle Lobe Syndrome + Key Features Download Section PDF Listen +++ ++ Recurrent or persistent atelectasis of the right middle lobe Related to the relatively long length and narrow diameter of the right middle lobe bronchus and its oval opening to the lobe Important to exclude obstructing lesion such as bronchogenic carcinoma + Clinical Findings Download Section PDF Listen +++ ++ Recurrent or slowly resolving right middle lobe pneumonia + Diagnosis Download Section PDF Listen +++ ++ Radiographic finding of recurrent atelectasis of right middle lobe CT scan or bronchoscopy is often necessary to rule out obstructing tumor Foreign body aspiration or other benign causes of atelectasis must be excluded + Treatment Download Section PDF Listen +++ ++ Treatment is of the underlying condition