Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and aortic valve replacement . Right - sided pacer is noted with single lead terminating in the right ventricle . Mild to moderate cardiomegaly is unchanged . The mediastinal contour is similar . There is mild pulmonary vascular congestion without frank pulmonary edema . Patchy atelectasis is seen in the lung bases , but no focal consolidation , pleural effusion or pneumothorax is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild to moderate cardiomegaly with mild pulmonary vascular congestion and patchy bibasilar atelectasis .