Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe enlargement of the cardiac silhouette is unchanged . The aorta is tortuous but similar . Mediastinal and hilar contours are similar in configuration . There is no pulmonary edema . Subsegmental atelectasis is noted in both lung bases without focal consolidation , pleural effusion or pneumothorax . Mild degenerative changes are present in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis . Moderate to severe cardiomegaly without pulmonary edema .