Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post aortic valve replacement . Dilatation of the aortic knob is again seen , grossly similar to ___ . There are surgical clips overlying the right upper outer hemithorax . Mild left base atelectasis . Overall , the lung volumes are relatively low . No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . Cardiac and mediastinal silhouettes are similar to ___ .
    OUTPUT:
    
No acute cardiopulmonary process . Similar appearance of the aorta .