Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , right basilar atelectasis is increased . Ill - defined focal opacity in the left mid lung , corresponding to known cavitary mass , is unchanged with retrocardiac and basilar atelectasis . A superimposed pneumonia can not be excluded in the right clinical setting . The heart size is normal . No pneumothorax .
    OUTPUT:
    
1 . No pneumothorax . Increase in mild to moderate right basilar atelectasis with unchanged appearance of known left cavitary mass .