Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improving right lower lobe consolidation . New focal consolidation in left retrocardiac region corresponding to posterior second left lower lobe . Persistent small left pleural effusion . Cardiomediastinal contours are within normal limits and note is made of previous median sternotomy and aortic valve replacement with stable tortuosity of the thoracic aorta appeared
    OUTPUT:
    
Improving right lower lobe consolidation which may reflect response of pneumonia to interval therapy . New focal left lower lobe opacity could reflect atelectasis , aspiration or an additional site of infection .