Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The cardiac , mediastinal and hilar contours are relatively unchanged with tortuosity of the thoracic aorta again noted . There is no pulmonary vascular congestion . Minimal linear opacities within both lower lobes likely reflect subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Multiple clips are seen within the right upper quadrant of the abdomen . Partially imaged is hardware within the left proximal humerus .
    OUTPUT:
    
Bibasilar subsegmental atelectasis .