Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes in the suboptimal inspiratory effort . There is mild to moderate enlargement of the cardiac silhouette . The mediastinal contours are within normal limits . The bilateral hila are obscured . Retrocardiac opacity obscuring the left hemidiaphragm likely relates to basilar atelectasis in the setting of a suboptimal inspiratory effort , however infection or sequela of of aspiration are possible in the correct clinical setting . There is no focal consolidation elsewhere . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Low lung volumes . Retrocardiac opacity likely reflects basilar atelectasis , however infection or aspiration may produce a similar appearance , and short - term followup radiographs may be helpful in this regard if warranted clinically . 2 . Mild to moderate cardiomegaly .