Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains moderately enlarged . Mediastinal and hilar contours are stable . Diffuse parenchymal opacities , more pronounced in the right lung base , are slightly improved compared to the previous study , suggestive of slight interval improvement in multifocal pneumonia . Mild pulmonary vascular congestion persists . Small right pleural effusion is also unchanged . No pneumothorax is identified .
    OUTPUT:
    
Diffuse parenchymal opacities , more pronounced in the right lung base , minimally improved overall compared to the previous exam , but remains compatible with multifocal pneumonia . There is persistent mild pulmonary vascular congestion and a small right pleural effusion .