Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube terminates approximately 2 .5 cm above the carina . Enteric tube is unchanged in position . Bronchovascular markings are accentuated by very low lung volumes . There is decreased opacification of the left hemithorax , which may reflect improving pleural effusion or semi-erect positioning . There is also left lung base atelectasis . No new areas of consolidation . No pneumothorax . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Decrease opacification of left hemithorax , which may reflect improving pleural effusion or may be due to semi-erect positioning . Lateral view would be helpful for further evaluation .