Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral . Compared to the prior study , there is even more heterogeneous opacity in the left lower lobe , obscuring the left hemidiaphragmatic contour . There are some new mostly linear opacities at the right lung base , likely atelectasis , but aspiration can not be ruled out . Stable mild cardiomegaly is present . The aoritc knob appears moreprominent on this exam , but this is likely an artifact due to slight rotation . Aortic calcifications are stable . COPD with extensive background bullous change and right apical pleural thickening and parenchymal scarring is again noted . R .L hilar retraction and prominent hila with a tapered appearance suggestive of pulmnary hypertension again noted . No pneumothorax or gross pleural effusion .
    OUTPUT:
    
1 ) Worsening left lower lobe pneumonia . 2 ) New opacity in the right lower lobe , etiologies can include aspiration or atelectasis . 3 ) Severe background COPD , detailed above . 4 ) Please see details regarding pulmonary nodular opacities on the report of a ___ CT scan .