Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is a minimal interstitial abnormality that appears less prominent than on the earlier examination . Otherwise , the lungs appear clear . There are no definite pleural effusions or pneumothorax . The chest is hyperinflated . Surgical clips project along the base of the left neck . There is no evidence for free air . Mild rightward convex curvature centered along the lower thoracic spine is similar . The bones are probably demineralized . Slight degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
Minimal interstitial abnormality which may reflect slight fluid overload but substantially decreased . No evidence for free air .