Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Chronic blunting of the left costophrenic angle may be due to trace pleural effusion . There are also likely atelectatic changes at the left lung base . No definite focal consolidation is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable . The patient is status post median sternotomy and CABG . Dual lead right - sided pacemaker is seen , placed in the interval since the prior study , with leads extending the expected positions of the right atrium and right ventricle .
    OUTPUT:
    
Low lung volumes . Blunting of the left costophrenic angle may be due to a trace pleural effusion . Likely left basilar atelectasis . No focal consolidation to suggest pneumonia .