Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . Streaky opacity in the left lung base likely reflects atelectasis and / or scarring with unchanged mild blunting of the left costophrenic sulcus likely reflective of pleural thickening rather than a small pleural effusion . The remainder the lungs are clear without focal consolidation , pleural effusion or pneumothorax . Pulmonary vasculature is normal . Moderate multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Streaky opacity in the left lung base appears similar compared to the previous exam , likely reflective of atelectasis and / or scarring and adjacent pleural thickening .