Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient 's condition required examination in sitting position using AP frontal and left lateral views . There is status post sternotomy , apparently related to previous bypass surgery . The heart size remains within normal limits . The thoracic aorta is mildly widened and elongated , but no local contour abnormalities are identified . A wide caliber double - lumen catheter has been introduced via the left internal jugular vein and advanced so to terminate in the mid portion of the right atrium . This HD line is also well demonstrated on the lateral view in its course through the SVC . The pulmonary vasculature is not congested . There is no evidence of any acute pulmonary parenchymal infiltrate . No pneumothorax in the apical area and lateral pleural sinuses are free . On the lateral view , a small amount of pleural effusion or pleural scar formation exists in the posterior pleural sinus on the left side .
    OUTPUT:
    
No evidence of pulmonary vascular congestion or acute infiltrates . When comparison is made with the next preceding chest examination transferred from ___ dated ___ , improvement of the at that time existing pulmonary vascular congestion is remarkable . The lungs are now completely clear and not congested .