Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post CABG and mitral and tricuspid valve replacement , with intact median sternotomy wires . There is atelectasis at the right lung base . There is mild interstitial edema , similar to prior . No pleural effusion or pneumothorax is seen . Cardiomegaly is not significantly changed .
    OUTPUT:
    
Mild interstitial edema , similar to prior .