Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes , accounting for some bronchovascular crowding . No focal opacities identified . Cardiomediastinal and hilar contours are unremarkable . Mild cardiomegaly is unchanged from prior . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .