Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This patient has a known eventration of the left hemidiaphragm which is resulting in the asymmetric elevation of the left hemidiaphragm compared to the right . Additionally , the mild linear opacity at the lung left lung base is likely a function of compressive atelectasis which was also seen on the prior chest CT . The lungs are clear and the cardiac and mediastinal contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Known eventration of the left hemidiaphragm . 2 . No evidence of pneumonia .