Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . The central pulmonary vessels appear more prominent in comparison to the prior radiograph , however , this most likely represents bronchovascular crowding in the setting of relatively lower lung volumes . No focal consolidation , pneumothorax , or pleural effusion is detected .
    OUTPUT:
    
No acute intrathoracic process .