Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is obscuration of the left hemidiaphragm , which may be due to a combination of atelectasis and pleural effusion , although a developing consolidation can not be excluded . The right lung is clear . The cardiac silhouette is top - normal . There is no pneumothorax .
    OUTPUT:
    
Retrocardiac opacity which may be due to a combination of atelectasis and pleural effusion , although a developing consolidation can not be excluded . Consider a lateral view for confirmation .