Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . There are streaky retrocardiac opacities as well as patchy increased right infrahilar opacity , although more likely due to atelectasis than pneumonia . Small osteophytes are present along the thoracic spine .
    OUTPUT:
    
Streaky basilar opacities , particularly in the left lower lobe . Pneumonia or atelectasis could be considered to explain the findings .