Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous study . This accentuates the size of the cardiac silhouette which appears mild to moderately enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Patchy opacities in lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .