Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . Small bilateral pleural effusions are suggested on the lateral with a right lower lobe opacity which could reflect atelectasis ; however infectious process can not be excluded . Cardiomediastinal contours are unchanged with diffuse calcification of the thoracic aorta .
    OUTPUT:
    
Small bilateral pleural effusions with right lower lobe opacity which could reflect atelectasis or infectious process .