Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Redemonstrated is a large right upper lobe paramedian mass , better evaluated on prior CT . Linear airspace opacities adjacent to the right hilum is unchanged over multiple prior CTs and likely represents scarring . The lungs are otherwise grossly clear without lobar consolidation , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Known , right upper lobe paramediastinal mass , better evaluated on prior chest CT .