Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior study , the heterogeneous opacities at the left base have slightly improved , with only mildly increased opacities remaining . The left chest wall dual - chamber pacemaker leads project in unchanged standard position . There is no focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Slight interval improvement in left base heterogeneous opacities , follow up radiographs in 4 weeks are recommended to document complete resolution .