Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment of the lung bases is slightly limited by respiratory motion . Cardiac , mediastinal and hilar contours are normal . The pulmonary vasculature is not engorged . Small left pleural effusion is noted with mild bibasilar patchy opacities , likely atelectasis . No pneumothorax is present . There are moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Small left pleural effusion . Mild bibasilar patchy opacities , likely atelectasis .