Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Lung volumes are low with crowding of the bronchovascular structures and mild pulmonary vascular engorgement . Linear opacities are seen in both lung bases likely reflective of subsegmental atelectasis . Small right pleural effusion is likely present . No focal consolidation or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar atelectasis and mild pulmonary vascular engorgement in the setting of low lung volumes . Probable trace right pleural effusion .