Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . A linear opacity extending from the right upper hilum may represent focal mucous impaction .
    OUTPUT:
    
A linear opacity extending from the right upper hilum may represent focal mucous impaction . While this does not explain the patient 's chest discomfort , it may reflect the sequela of underlying small airways disease such as asthma . If clinically warranted , additional shallow and full left oblique views could be obtained to further assess this area . The updated findings were emailed to the ___ nursing staff by Dr . ___ on ___ for followup with this patient 's primary care practice .