Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size but with a left ventricular configuration . The mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease .