Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . The lungs are clear . No focal consolidation , edema , effusion , or pneumothorax . Blunting of the posterior CP angles is chronic either from pleural thickening / scarring and / or chronic effusion . The heart is normal in size . The descending thoracic aorta remains tortuous . Left curvature of the thoracic spine is again noted . No acute osseous abnormality . Multilevel degenerative changes in the thoracic spine are mild .
    OUTPUT:
    
No acute cardiopulmonary process .