Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An opacity at the left lung base obscures the left hemidiaphragm and may be due to a combination of pleural effusion and atelectasis . A small right pleural effusion is also present . The cardiomediastinal silhouette remains mildly enlarged . There is no pneumothorax . Included upper abdomen is unremarkable .
    OUTPUT:
    
1 . Opacity at the left lung base may be due to combination of pleural effusion and atelectasis . However , a developing pneumonia can not be excluded in the appropriate clinical setting . Repeat PA and lateral views could be helpful when clinically appropriate . 2 . Small right pleural effusion .