Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are within normal limits allowing for apical lordotic projection and relatively low lung volumes . Bilateral lower lobe opacities are present , with some interval improvement on the right , but slight worsening in the left retrocardiac region . On the lateral view , these project posteriorly over the spine and are associated with air bronchograms . There are no pleural effusions . Skeletal structures are unremarkable .
    OUTPUT:
    
Bibasilar confluent opacities , slightly improved on the right and slightly worse on the left . Considering recent history of altered mental status , aspiration pneumonia should be considered in the appropriate clinical setting .