Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Relative linear opacity at the left lung base may relate to atelectasis , although underlying consolidation due to infection or aspiration can not be excluded in the appropriate clinical setting . There are low lung volumes and there is mild elevation of the right hemidiaphragm . Perihilar peribronchial thickening is again seen . No pleural effusion or pneumothorax seen . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
1 . Low lung volumes with mild elevation of the right hemidiaphragm . 2 . Relative linear somewhat patchy opacity at the left lung base could relate to atelectasis , although consolidation is not excluded in the appropriate clinical setting . 3 . Persistent peribronchial thickening stable to slightly increased given differences in inspiration .