Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged . Cardiomediastinal contours are otherwise unremarkable . Lung volumes are low with bibasilar atelectasis , but there is no lobar consolidation , pneumothorax , or substantial pleural effusion . Spinal fusion construct appears stable . Right posterior rib fracture is chronic .
    OUTPUT:
    
Moderate cardiomegaly with low lung volumes and bibasilar atelectasis . No lobar consolidation or pleural effusion .