Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new consolidation in the retrocardiac left lung base , concerning for pneumonia or aspiration . No pleural effusion or pneumothorax is seen . There is mild pulmonary vascular congestion . The mediastinal silhouette is unchanged . Multiple intact mediastinal wires relate to prior sternotomy .
    OUTPUT:
    
Left lower lobe consolidation , may represent pneumonia or aspiration .