Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube is unchanged with tip ending at 4 .5 cm from carina . Lung volume is still low . Left retrocardiac opacification likely for atelectasis . There is mild vascular engorgement . There is no pleural effusion or pneumothorax . Cardiac size is top normal .
    OUTPUT:
    
Left retrocardiac opacification , likely for atelectasis with mild vascular engorgement but without pleural effusion .