Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . The lungs are low in volume giving the appearance of bronchovascular crowding but are otherwise clear . There is no pleural effusion or pneumothorax . The heart is top normal in size with normal cardiomediastinal contours . Ventriculoperitoneal shunt catheter is seen coursing through the chest and into the abdomen .
    OUTPUT:
    
No acute intrathoracic process .