Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post aortic valve replacement . The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . The aorta is partly calcified . Bilateral nipple shadows are visualized . Fine reticulation in the periphery of the basilar portions of the lungs suggesting interstitial changes is similar since the prior study without evidence for a superimposed process . Mild degenerative changes are similar along the thoracic spine . The bones are probably demineralized to some degree .
    OUTPUT:
    
Similar mild interstitial process . Status post aortic valve replacement . Suspected bony demineralization .