Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . There is evidence of prior CABG . Midline sternal wires are intact and well aligned . The central pulmonary vasculature is somewhat congestion , without overt edema . There is no pleural effusion or pneumothorax . The lungs are grossly clear without definite consolidation .
    OUTPUT:
    
No acute intrathoracic abnormality identified .