Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral linear opacities are not significantly changed since ___ . There is no vascular congestion , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
Multiple linear opacities most likely represent plate - like atelectasis or scarring unchanged since ___ . No mass identified ; however , if there is strong clinical suspicion for a mass , CT of the chest is recommended .