Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear atelectasis or scarring is again seen at the left lung base . The lungs remain relatively hyper expanded with relative paucity of vascular structures particularly in the right upper lung raising the possibility of underlying emphysema . No focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is unchanged in appearance .
    OUTPUT:
    
Hyperexpanded lungs with possible underlying emphysema . Stable left basilar atelectasis or scarring without evidence for acute cardiopulmonary process .