Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Lung volumes are low . There is indistinctness of the central pulmonary vasculature . Septal lines have thickened compared with the prior study . The sternotomy wires are intact . Moderate cardiomegaly is stable . The trachea remains deviated to the right by the aortic arch .
    OUTPUT:
    
Interstitial edema superimposed on probable chronic interstitial disease .