Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart size is normal . Mediastinal and hilar contours are unremarkable . Linear opacities within the left lung base are compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is detected . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Subsegmental left basilar atelectasis . Otherwise no acute cardiopulmonary abnormality .