Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lines and tubes are unchanged in positio . Low lung volumes with bibasilar opacities , likely representing atelectasis . No focal consolidations . The pulmonary vasculature is normal . There is a stable appearance of the cardiomediastinal silhouette . There may be a small left pleural effusion . There is no pneumothorax .
    OUTPUT:
    
1 . Unchanged positions of lines and tubes . 2 . Low lung volumes with bibasilar atelectasis , but no focal consolidations to suggest pneumonia . 3 . Possible small left pleural effusion .