Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube terminates 5 cm from the carina . Eneteric catheter tip terminates at the pylorus . A left subclavian line is seen in the region of the superior cavoatrial junction . There has been interval decrease of the lung volumes . Left lower lobe opacification is unchanged from prior examination and could either represent pneumonia or atelectasis . The right lung is clear . There is no pneumothorax or pleural effusion . There is mild cardiomegaly , exaggerated by low lung volumes and by vascular engorgement . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
1 . Low lung volumes . 2 . Unchanged left lower lobe pneumonia or atelectasis .