Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates in the uppermost part of the right atrium , as before , and the patient is status post posterior fusion surgery involving the upper thoracic spine , not completely assessed , but apparently unchanged . The heart appears mildly enlarged . The mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute disease .