Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are median sternotomy wires and prosthetic aortic and mitral valves . The previously seen mild interstitial edema has improved . Mild cephalization of the pulmonary vasculature is unchanged . Small bilateral pleural effusions have slightly decreased in size . The lungs are better aerated compared to the ___ radiographs . The heart size is mildly enlarged but has decreased in size since ___ . There is no focal consolidation or pneumothorax . The aortic knob is calcified .
    OUTPUT:
    
Interval improvement in mild interstitial edema and small bilateral pleural effusions .