Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable and within normal limits . Lung volumes are slightly low however there is no focal consolidation , pleural effusion or pneumothorax . Lucency of the upper lungs is consistent with emphysema and stable from prior exams .
    OUTPUT:
    
No acute intrathoracic process .