Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged . The mediastinal and hilar contours are unremarkable . There is no definite pleural effusion or pneumothorax . Patchy medial left basilar opacity suggests minor atelectasis . Otherwise , the lungs appear clear . Slight opacification of the right cardiophrenic sulcus is probably due to a cardiac fat pad . Moderate degenerative changes are present along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .