Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single frontal chest radiograph was obtained . The tip of the ET tube terminates 4 cm above the carina . The NG tube terminates in the body of the stomach with the side hole near the gastroesophageal junction . A left subclavian line terminates in the lower SVC . Lung volumes have decreased with bibasilar opacities . A small left pleural effusion is present . The heart size is normal . Mediastinal and hilar contours are stable . There is no pneumothorax .
    OUTPUT:
    
1 . Increased opacity at bilateral lung bases with lower lung volumes , most likely secondary to atelectasis . Pneumonia is less likely . 2 . Small left pleural effusion .