Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-erect position . Comparison is made with the next preceding similar study obtained on the morning of the preceding day ___ . On the present portable examination , the patient is more rotated to the right as on the preceding examination . Again noted is significant cardiac enlargement and presence of surgical clips in the left - sided mediastinal structures compatible with previous bypass surgery . Absence of the usual sternal wires is noted . The grid - shaped structures of a CoreValve device are again identified and occupy the area of the left ventricular outflow tract and the root of the aorta . These structures are in unchanged position in comparison with the previous study . Comparison of pulmonary vasculature suggests that vascular distention and perivascular haze is less marked than it was on the preceding study . Again noted are relatively high positioned diaphragms indicative of poor inspirational mechanics . No pneumothorax can be seen .
    OUTPUT:
    
Comparison of portable chest examination suggests some improvement of pulmonary vascular congestion .