Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are poorly inflated , accounting for some vascular crowding , more conspicuous in the lower lobes . Allowing for these limitations , the lungs are clear without focal opacities . Cardiac size is top normal . Mediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .