Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously described masslike opacity since ___ has significantly improved , with residual heterogeneous opacity , suggesting focal infection or atelectasis over malignancy . There is new mild opacity in the right middle lobe . The lungs are otherwise clear . Heart size is stable with mild cardiomegaly . The mediastinal and hilar contours are stable . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
The previously described masslike opacity since ___ has significantly improved , with residual heterogeneous opacity , suggesting focal infection or atelectasis over malignancy . There is new mild opacity in the right middle lobe , which could also represent worsening pneumonia in the appropriate clinical setting .