Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and mitral valve replacement . Marked cardiomegaly appears slightly increased since the previous study . Atherosclerotic calcifications at the aortic knob are again seen . Worsening a mild to moderate pulmonary edema is present compared to the previous study with bibasilar atelectasis noted . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is clearly seen .
    OUTPUT:
    
Mild to moderate pulmonary edema and increased cardiomegaly .