Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the prior chest radiograph , lung volumes have increased . Streaky and linear bibasilar airspace opacities are again noted , similar to the prior examination . Mild central pulmonary vascular congestion is essentially unchanged . Blunting of the left costophrenic angle may reflect atelectasis versus trace pleural effusion . There is no large pleural effusion or pneumothorax . Moderate cardiomegaly is stable . A left pectoral pacemaker and its 3 leads are unchanged in position .
    OUTPUT:
    
1 . Bibasilar airspace opacities likely reflect atelectasis , although superimposed infection is difficult to exclude . 2 . Moderate cardiomegaly and mild central pulmonary vascular congestion .