Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A ventriculoperitoneal shunt courses across the right side of the thorax . It s distal course is very difficult to delineate because of underpenetration . The mediastinal and hilar contours appear unchanged . There is similar mild cardiomegaly . The lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .