Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . A focal opacity in the left lower lung remains faintly visible but apparently decreased substantially . Patchy right mid lung opacity suggests scarring or atelectasis without change . There is no definite pleural effusion but a trace pleural effusion on the right is difficult to exclude . The bones are probably demineralized .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .