Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . Bibasilar opacities may be secondary to atelectasis . . There is no pleural effusion or pneumothorax . Pulmonary vasculature is normal . There is no overt pulmonary edema . Mediastinal and hilar contours are stable . Heart size is normal . Clips in the lower neck are again noted .
    OUTPUT:
    
1 . No acute intrathoracic process . No pleural effusion . 2 . Probable bibasilar atelectasis .