Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Patient is status post median sternotomy and CABG . The inferior aspect of the cardiac silhouette appears somewhat elevated from the diaphragm and there may be lung intervening between the inferior aspect of the heart and the diaphragms . Query whether this relates to prior procedure in the interval since the prior study . Most recent priors are from ___ . Comparison with more recent prior chest radiographs would be helpful for comparison . No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . The mediastinum is not widened . Hilar contours are unremarkable . Degenerative changes are seen along the spine .
    OUTPUT:
    
Inferior cardiac silhouette appears elevated more superiorly in relation to the diaphragm than is typically seen , of unclear clinical significance , but is likely chronic and m may relate to lung parenchyma between the heart and diagphram . Comparison with any prior radiographs since ___ would be helpful to confirm acuity .