Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without consolidation or edema . There is no pleural effusion or pneumothorax . The mediastinal contours are normal . The heart size is at the upper limits of normal . This is improved from the prior radiograph , at which time the heart was moderately enlarged . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of pneumonia .