Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy and postsurgical changes reflect prior CABG . Upright AP and lateral radiographs of the chest demonstrate relatively low lung volumes with bibasilar atelectasis . Indistinctness of the hila , pulmonary and mediastinal vascular congestion and mild edema reflect biventricular heart failure . The heart is normal size , but bigger than it was in ___ . Pleuroparenchymal scarring elevates the left lung base and there is extensive thickening of the left costal pleura , with a triangular region of atelectasis in the midling , and a lesser degree in the right hemithorax . There may also be some acute left pleural effusion and even left basal pneumonia . There is no pneumothorax .
    OUTPUT:
    
1 . Mild biventricular heart failure . 2 . In addition to extensive pleuroparenchymal scarring , predominantly in the left chest , there could be some active left pleural effusion and even left basal pneumonia . The above findings were communicated to Dr . ___ by Dr . ___ ___ telephone at 2 : 45 am , ___ min after discovery . Updated findings discussed with Dr ___ at 8 : 40 am by Dr ___ .