Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 1 day prior , mild pulmonary edema has decreased . Small , bilateral pleural effusions have minimally increased in size . Mild cardiomegaly is unchanged with mild persistent pulmonary vascular congestion . Moderate calcification of the aortic knob is unchanged . Median sternotomy wires are well aligned and intact .
    OUTPUT:
    
Mild pulmonary edema has improved . Increased , but small , bilateral pleural effusions .