Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is mild prominence of the contour associated with the left atrial appendage . There is no pleural effusion or pneumothorax . Streaky opacity in the lingula suggests mild atelectasis or scarring . Otherwise , the lungs appear clear . Mild rightward convex curvature is centered along the mid thoracic spine . The bones are possibly demineralized to some degree . Degenerative changes are mild .
    OUTPUT:
    
No evidence of acute disease . Mild prominence of left atrial appendage , which may suggest left atrial enlargement . Streaky left lung opacities most consistent with minor scarring or atelectasis .