Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is small eventration of the right hemidiaphragm . There is no pleural effusion or pneumothorax . Streaky posterior left basilar opacity suggests minor atelectasis . Elsewhere , the lungs appear clear . Moderate to severe rightward convex curvature is centered at the thoracic thoracolumbar junction and appears unchanged with incompletely characterized , but probably similar , degenerative changes .
    OUTPUT:
    
Posterior left basilar opacity , probably consistent with atelectasis .