Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . The mediastinal and hilar contours are unchanged . Low lung volumes causes crowding the bronchovascular structures without overt pulmonary edema . Small bilateral pleural effusions are not substantially changed in the interval , with bibasilar opacities , more pronounced on the left , likely reflective of compressive atelectasis . Infection is not excluded . There is no pneumothorax . Diffuse degenerative changes are again seen within the thoracic spine with mild compression deformities of several upper lumbar vertebral bodies .
    OUTPUT:
    
Unchanged small bilateral pleural effusions with bibasilar atelectasis . Please note that infection in the lung bases however can not be completely excluded .