Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and right lower lobectomy . Heart size is top normal . Aortic knob calcifications are re- demonstrated . Mediastinal contours are unchanged . Compared to the prior chest radiograph , the degree of diffuse right lung opacification has improved , with improved aeration particularly in the right upper lung field . Emphysematous changes are again seen within the right apex . There is a small right pleural effusion . Patchy opacities within the medial aspect of the left lung base are unchanged . No pneumothorax is identified . There is no pulmonary vascular engorgement .
    OUTPUT:
    
Interval improvement in aeration of the right lung compared to the prior study , but there is persistent hazy opacification within the right lung base concerning for persistent pneumonia . Small right pleural effusion is present . Continued patchy opacity in the medial aspect of the left lung base , also concerning for additional site of infection .