Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs compared with ___ demonstrate clear , though hyperinflated lungs without effusion or pneumothorax . The heart size is mildly enlarged . The aortic contour appears tortuous . There is multilevel degenerative change of the thoracic spine .
    OUTPUT:
    
Stable pulmonary hyperinflation compatible with COPD . There is mild cardiac enlargement , though there is no evidence of decompensation .