Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is bibasilar atelectasis . No definite pleural effusion is seen on the lateral view . There is rounded retrocardiac opacity seen , which was not optimally assessed on this study , may be due to a large hiatal hernia . The aorta is calcified and tortuous . The cardiac silhouette is enlarged . No definite focal consolidation is seen . There is no pneumothorax . Kyphoplasty / vertebroplasty in the mid - to - lower thoracic spine is noted .
    OUTPUT:
    
Large retrocardiac rounded opacity may correspond to a large hiatal hernia . Correlate with history of such . Basilar atelectasis without definite focal consolidation .