Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Streaky opacities in posterior lower lobes are more extensive on the left than right and most suggestive of atelectasis , although coinciding infection is not excluded . Surgical clips project over the right upper quadrant . The bones are unremarkable . The vertebral body heights and interspaces appear preserved .
    OUTPUT:
    
Opacities at both lung bases , although more suggestive of atelectasis than pneumonia . Correlation with clinical presentation is suggested .