Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Focal pleural and parenchymal scarring at left lung base laterally appears similar to an older radiograph of ___ . No new areas of consolidation are evident within the lungs to suggest an acute pneumonia . New linear atelectasis is present at the extreme right lung base posteriorly . No acute skeletal findings .
    OUTPUT:
    
No evidence of pneumonia .