Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe opacity with leftward cardiac shift is concerning for an obstructive pneumonia . Moderate bibasilar and retrocardiac atelectasis is noted . There is a small right pleural effusion . Heart size is mildly enlarged . A feeding tube is seen in the stomach . No pneumothorax .
    OUTPUT:
    
1 . Left lower lobe opacity with leftward cardiac shift is concerning for an obstructive pneumonia . 2 . Moderate bibasilar atelectasis and small right pleural effusion is noted .