Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The lungs are hyperinflated . Patchy left base opacity is seen , which could represent pulmonary atelectasis , although underlying consolidation is not excluded . Dedicated PA and lateral views to be helpful for further evaluation . The cardiac silhouette remains top normal to mildly enlarged . The patient is status post median sternotomy and CABG . There is slight blunting of the left costophrenic angle , which could be due to pleural thickening or a trace effusion . Degenerative changes at the right acromioclavicular joint are noted .
    OUTPUT:
    
1 . Medial left base opacification may be due to atelectasis , infection or aspiration . PA and lateral views may be helpful for further evaluation . 2 . Chronic blunting of the left costophrenic angle .