Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are poorly inflated which accounts for vascular crowding . Linear atelectases are noted in the left lower base , which are improved compared with prior exam . Otherwise , there are no focal opacities . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .