Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged . Heart size is within normal limits . The pulmonary vascularity is not engorged . Bilateral areas of pleural thickening laterally are similar when compared to the prior study . Streaky opacity in the left lung base appears new when compared to prior CT from ___ scout radiograph , and could represent area of developing infection . No pleural effusion or pneumothorax is present . There are multiple old right - sided rib deformities . There are multilevel degenerative changes of the thoracic spine are redemonstrated .
    OUTPUT:
    
Patchy ill - defined opacity in the left lung base appears new when compared to the prior CT , and could represent an area of developing infection or atelectasis . Stable areas of chronic pleural thickening bilaterally .