Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest are provided . There are small bilateral pleural effusions with associated bibasilar atelectasis . Please note , given the presence of atelectasis in the lower lungs , a subjacent pneumonia would be impossible to exclude in the correct clinical setting . The heart size can not be assessed . The mediastinal contour appears unremarkable aside from the presence of aortic knob calcification . The bony structures are intact . No pneumothorax is seen .
    OUTPUT:
    
Small bilateral pleural effusions with bibasilar opacities likely representing atelectasis , though pneumonia not entirely excluded .