Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two frontal views of the chest was obtained portably . A left port -A - Cath ends in the upper SVC . Since ___ , there is improved aeration of the bilateral lung fields . Bibasilar opacities may represent atelectasis , scarring or residual consolidation , right worse than left , similar to the prior study . Small pleural effusions are better seen on concurrent CT . Heart size is normal . There is mild aortic tortuosity . The nipple projecting over the right lower lung should not be mistaken for a lung nodule .
    OUTPUT:
    
Improved aeration since ___ . Bibasilar opacities , right more than left , may be atelectasis or residual consolidation .