Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Left chest wall single lead pacing device is again seen . Low lung volumes noted on the current exam with linear opacities at the left mid to lower lung . There is also crowding of bronchovascular markings likely due to lower lung volumes . The cardiomediastinal silhouette is enlarged but stable . No acute osseous abnormalities .
    OUTPUT:
    
Left mid to lower lung opacities potentially due to atelectasis although underlying infection is also possible . Consider repeat PA and lateral views to better characterize if patient is amenable .