Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A marked dextroscoliosis of the thoracic spine is noted . There is linear left perihilar opacities which are stable from prior exam and likely represents scarring or atelectasis . There is no evidence of pneumonia or CHF . No large effusion or pneumothorax . Overall cardiac mediastinal silhouette is stable .
    OUTPUT:
    
Left perihilar linear densities likely represent atelectasis or scarring . Marked dextroscoliosis of the thoracic spine . No signs of pneumonia .