Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacity in the right base likely represents fibrosis as this is unchanged since ___ . The lung volumes are normal . Normal size of the cardiac silhouette . Normal hilar and mediastinal structures . No pneumonia , no pulmonary edema . No pleural effusions .
    OUTPUT:
    
Fibrosis at the right lung base which is unchanged from ___ . Otherwise normal chest radiograph without evidence of pneumonia .