Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to prior chest x-ray from ___ and CT torso from ___ . There has been interval progression of middle and lower lobe parenchymal opacities since prior chest CT . This could be due to any combination of atelectasis or infection . Possibility of infarction is also raised given extensive clot burden in this vascular territory . Elsewhere , the lungs are clear . Left chest wall port with catheter tip seen in the mid SVC . The osseous structures are unremarkable . CBD stent is partially visualized in the upper abdomen . The soft tissues are otherwise unremarkable .
    OUTPUT:
    
Progression of right lower and middle lobe opacities , potentially due to infection or infarct given recent pulmonary emboli in this distribution .