Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal hilar contours are normal with top normal heart size . There is no pleural effusion or pneumothorax . Lung volumes are low , and there is perihilar and basilar prominence of uncertain etiology . There is no focal consolidation concerning for pneumonia .
    OUTPUT:
    
Bilateral perihilar and bibasilar opacities , which may represent venous congestion . In the appropriate clinical setting , this could be consistent with pneumonia or aspiration as well .