Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . In the left lung base , there is a linear opacity that was not previously seen , likely reflecting atelectasis . Repeating study in shallow anterior oblique view is recommended for further evaluation . Pulmonary vasculature is normal . Heart size is normal . Mediastinal and hilar contours are normal . There is no pleural effusion .
    OUTPUT:
    
Left base linear opacity , likely atelectasis . Repeat radiograph in shallow anterior oblique view is recommended .