Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged , and there is no pulmonary vascular congestion . Linear opacities in the left lower lobe are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Subsegmental atelectasis in the left lower lobe . No acute cardiopulmonary abnormality otherwise identified .