Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval mild improvement in the right basilar opacities with persistent bilateral diffuse interstitial opacities and unchanged left retrocardiac opacity . Stable cardiomediastinal silhouette an aortic knob calcification . Unchanged position of a left - sided pacemaker with intact pacer wires . EKG leads overlie the patient . Visualized bones are unremarkable .
    OUTPUT:
    
Unchanged interstitial edema and left retrocardiac opacity that may represent atelectasis and / or consolidation with a small left pleural effusion . Improvement in right basilar atelectasis / consolidation .