Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are extremely low accentuating the cardiac silhouette and pulmonary vasculature . Within this context , heart size is likely normal . Cardiomediastinal silhouette and hilar contours are otherwise unremarkable . Bibasilar opacities are present , likely representing atelectasis . No large pleural effusion or pneumothorax .
    OUTPUT:
    
Extremely low lung volumes with bibasilar opacities likely representing atelectasis , though pneumonia can not be excluded .