Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . No pneumonia , pulmonary edema , or pleural effusion . Linear opacity at the left base is consistent with subsegmental atelectasis . Right lateral linear opacity is unchanged and may represent scaring . Mediastinal contours , hila , and cardiac silhouette are normal . Bilateral expansile rib lesions are unchanged from ___ .
    OUTPUT:
    
No evidence of pneumonia .