Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal contours are relatively unremarkable . Streaky linear opacities within both lung bases likely reflect subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There is no pulmonary vascular congestion . No acute osseous abnormalities are demonstrated .
    OUTPUT:
    
Mild bibasilar atelectasis .