Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant improvement in bilateral pulmonary infiltrates since prior . Areas of parenchymal scarring , distortion , in the mid upper lungs , with traction bronchiectasis , consistent with sarcoidosis . Normal heart size . No pleural effusion . Cardiac pacemaker , single lead tip in the right ventricle . No pneumothorax .
    OUTPUT:
    
Interval improvement . No pneumothorax