Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Midline sternotomy wires and prosthetic cardiac valve are noted . Lung volumes are low . Heart is mildly enlarged . There is mild interstitial edema . No large effusion is seen . Overall mediastinal contour is prominent though this could be due to vascular ectasia . Bony structures are intact .
    OUTPUT:
    
Mild interstitial edema and mild cardiomegaly .