Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unchanged flattening of the hemidiaphragms consistent with COPD . There is no focal consolidation , pleural effusion , or pneumothorax . The cardiac silhouette and mediastinal contours are normal . The pulmonary vasculature is normal . There is unchanged degenerative appearance of the thoracic spine .
    OUTPUT:
    
COPD , without acute chest abnormality .