Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no pleural effusion , pneumothorax or focal air space consolidation . The heart size is top normal and the right pulmonary artery appears prominent , although these findings are stable . There are mild degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute intrathoracic process .