Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . There is a streaky opacity , which is better seen on the lateral view , residing inferior and posterior to the hilum and probably relates to the left lower lobe where patchy atelectasis was seen on the recent prior CT . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Left basilar opacity , the morphology of which suggested minor atelectasis on the recent prior CT , although it is possible that the situation may have changed and early bronchopneumonia is not excluded by this study .