Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made to chest radiograph dated ___ . AP upright and lateral chest radiograph demonstrates increased opacity at the right upper lobe and right lung base . More linear opacity along the left lung base is additionally noted . Though the latter finding may reflect atelectasis , the right lung base opacity may reflect an early infectious process . Cardiomediastinal and hilar contours are stable in appearance . There is no pleural effusion or pulmonary edema .
    OUTPUT:
    
Bibasilar opacities which may reflect a component of atelectasis though an infectious process can not be excluded , particularly at the right lung base and right upper lobe .