Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Tracheostomy tube remains in unchanged position . Cardiac silhouette size is mildly enlarged . Mediastinal and hilar contours are unchanged . Lung volumes are reduced compared to the previous exam . New alveolar opacities are demonstrated within the left upper and lower lung fields as well as a patchy opacity within the right lung base . No pleural effusion , pulmonary vascular congestion , or pneumothorax is identified . Remote fracture of the left 2nd rib is again seen . There are vascular calcifications noted .
    OUTPUT:
    
New alveolar opacities within the left upper land ower lung fields concerning for pneumonia . Patchy right basilar opacity could reflect an reflect additional site of infection or atelectasis .