Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear without focal consolidation , effusion or pneumothorax . Mediastinal and hilar contours are stable . Mild cardiomegaly is unchanged . Patient is status post CABG with intact median sternotomy wires . Coronary stents and prosthetic aortic valve are present .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Stable mild cardiomegaly .