Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen right middle lobe opacification has been resolved . There is no focal opacification in the lungs . No pneumothorax or pleural effusion is identified . Cardiomediastinal and hilar silhouettes are normal size . In the lateral view , either or both left and right major fissure appears dense . This may represent atelectatic changes or pleural fluid collection .
    OUTPUT:
    
Interval resolution of right middle lobe opacification . Dense appearing major fissure may represent atelectatic changes or pleural pleural fluid collection .