Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . There are slightly increased interstitial markings without evidence of frank edema or consolidation . There is no effusion . Cardiac silhouette is enlarged but unchanged . Aortic valve replacement is noted as well as postoperative changes of median sternotomy . Osseous and soft tissue structures are notable for hypertrophic changes in the spine .
    OUTPUT:
    
Increased interstitial markings in the lungs , which could be due to mild interstitial edema versus chronic underlying interstitial lung disease .