Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is large , also likely exaggerated by projection in position . Mediastinal and hilar contours appear unremarkable . The lung volumes are low , leading to vascular crowding , but no obvious consolidation or overt edema exists . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes , but no acute cardiopulmonary process .