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 . Comparison is made with the preoperative chest examination of ___ . There existed already marked cardiac enlargement on the pre-operative chest examination with most prominent left ventricular contour to the left and posteriorly . Left atrial contour was only mildly prominent on the lateral view but pulmonary vascular pattern demonstrate an upper zone redistribution indicative of mildly increased chronic pulmonary congestion . On the present examination , the AP frontal view demonstrates the multiple metallic sternotomy wires in midline . The heart shadow remains similar in size , but there is now a remaining postoperative obliteration of the diaphragmatic contour and some blunting of the posterior pleural sinuses bilaterally on the lateral view suggestive of some remaining bilateral pleural effusion postoperatively . On the preoperative chest findings , these pleural densities were not seen . There is no evidence of pneumothorax on the frontal view but a degree of upper zone redistribution pattern remains .
    OUTPUT:
    
Postoperative AP and lateral chest views demonstrate unchanged enlarged heart size , new left basal density compatible with left lower lobe atelectasis and some postoperative pleural effusions . No pneumothorax and no evidence of new acute pulmonary infiltrates .