Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral low lung volumes again noted . New opacity in the right base probable atelectasis but can not exclude pneumonia . Mild improvement in left pleural effusion and left base opacity noted with air bronchograms , concerning for pneumonia . Cardiomediastinal silhouette unchanged . There is no pneumothorax .
    OUTPUT:
    
Left base opacity concerning for pneumonia with associated left pleural effusion mildly improved . Probable right base atelectasis but can not exclude pneumonia .