Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The aorta shows mild unfolding . Patchy calcification is noted along the arch . There is mild elevation of the left hemidiaphragm probably due to mild volume loss at the left lung base and a prominent gastric bubble . There is no pleural effusion or pneumothorax . Mild leftward convex curvature is centered at the thoracolumbar junction . The bones are probably demineralized to some degree .
    OUTPUT:
    
Findings suggesting atelectasis at the left lung base , but no convincing evidence for pneumonia or congestive heart failure .