Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and aortic and mitral valve repair . Moderate cardiomegaly is unchanged . Right internal jugular central venous catheter tip terminates in the low SVC . Mediastinal contours are similar . Moderate pulmonary edema is not substantially changed . More focal opacities within the lung bases , particularly within the right lung base , may reflect areas of superimposed infection . Small bilateral pleural effusions , larger on the right , are not substantially changed . No pneumothorax is present . Degenerative spurring is noted within the imaged thoracic spine .
    OUTPUT:
    
Moderate pulmonary edema , not substantially changed in the interval , with small bilateral pleural effusions , larger on the right . More focal bibasilar airspace opacities , more so within the right lung base , concerning for superimposed infection .