Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged . Pulmonary vascularity is not engorged . Linear opacities overlying the right lung base likely reflects subsegmental atelectasis . Deformity of the left chest wall is unchanged . Mild compression deformity of an upper lumbar vertebral body is unchanged . There is diffuse calcification of the imaged aorta and multilevel degenerative changes of the thoracic spine are again seen . There is no pleural effusion or pneumothorax . Blunting of left costophrenic angle is chronic , and likely reflects pleural thickening .
    OUTPUT:
    
Subsegmental atelectasis in the right lung base , but no acute cardiopulmonary abnormality .