Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hypoinflated , accounting for vascular crowding . There are no focal opacities bilaterally . Cardiomediastinal and hilar contours are unremarkable . Some aortic tortuosity is noted . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute intrathoracic process .