Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Cardiac silhouette size remains moderately enlarged but unchanged . The aorta remains tortuous . Pulmonary vasculature is mildly engorged . Linear and patchy bibasilar opacities likely reflect areas of atelectasis . Small left pleural effusion appears relatively unchanged compared to the previous study . No pneumothorax is identified . There are no acute osseous abnormalities . Degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular engorgement and unchanged small left pleural effusion . Continued bibasilar atelectasis .