Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary bypass surgery . Heart is normal in size . Pacing device remains in place with leads unchanged in position . A new poorly defined area of consolidation has developed in the left lower lobe posteriorly . No definite pleural effusion .
    OUTPUT:
    
Left lower lobe consolidation , which may reflect history of recent pneumonia . Followup chest radiograph is recommended in 4 weeks to document complete resolution .