Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , right basilar and the left retrocardiac basilar opacities are mildly improved with residual focal atelectasis or scarring . The lungs are otherwise clear with normal lung volumes . The cardiac size is normal . No pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Right basilar and the left retrocardiac basilar opacities are mildly improved with residual focal atelectasis or scarring .