Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size remains top normal . Mediastinal and hilar contours are unchanged . There is no pulmonary vascular congestion . There has been interval improvement in aeration of the right lung base , with residual linear opacities likely reflective of atelectasis . Within the left lung base , there are persistent patchy and streaky airspace opacities , slightly worse in the interval . This could reflect atelectasis though infection or aspiration is not excluded . Lungs remain hyperinflated . No significant pleural effusion is demonstrated , and there is no pneumothorax . No acute osseous abnormalities are detected . Mild loss of height anteriorly of a lower thoracic vertebral body is unchanged .
    OUTPUT:
    
Left basilar patchy and streaky opacity appears slightly worse in the interval , possibly atelectasis though infection or aspiration is not excluded . Interval improvement in aeration of the right lung base with residual atelectasis .