Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left hemidiaphragm is obscured , likely due to atelectasis , although a superimposed infection is also possible . There is atelectasis at the right lung base . The cardiac silhouette is mildly enlarged . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Likely atelectasis at the left lung base , although a superimposed infection can not be excluded .