Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs again demonstrate top normal heart size and low lung volumes . However , there is no pulmonary vascular congestion or large pleural effusion . The cardiac , hilar and mediastinal contours are normal . Scattered linear scarring at the lung bases is chronic .
    OUTPUT:
    
No acute cardiopulmonary process .