Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Apart from atelectasis in the lung bases , lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . Widening of the right acromioclavicular joint is likely related to prior surgery , unchanged .
    OUTPUT:
    
Minimal bibasilar atelectasis in the setting of low lung volumes . Otherwise , no acute cardiopulmonary process .