Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of chest demonstrate clear lungs . Cardiac silhouette is normal in size . There is no evidence of pneumonia , pleural effusion or pulmonary edema . Degenerative changes are noted throughout the thoracic spine . There is no abdominal free air .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .