Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . Lung volumes are low . Previously , the left hemidiaphragm was slightly depressed compared to the right , but now with mild relative elevation instead . Particularly that setting , streaky basilar opacities suggest atelectasis with volume loss . Trace pleural effusions are difficult to exclude . There is no pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Left basilar opacity highly suggestive of atelectasis . Infection is hard to exclude but less likely .