Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are without focal consolidation . No bibasilar opacities are likely to reflect atelectasis . Low lung volumes are noted . There is no pleural effusion , pulmonary edema , or pneumothorax . The heart is moderately enlarged as before with fullness of the azygous vein suggesting an elevated central venous pressure .
    OUTPUT:
    
Bibasilar atelectasis . Mild central venous congestion .