Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Linear opacities are present in the mid and lower lungs bilaterally , but there are no focal areas of lung consolidation . No pleural effusion or pneumothorax is evident .
    OUTPUT:
    
Linear mid and lower lung atelectasis or scarring with otherwise clear lungs .