Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta remains tortuous . Mediastinal and hilar contours are otherwise unremarkable . The pulmonary vasculature is normal . Apart from mild bibasilar atelectasis , lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . Diffuse demineralization of the osseous structures is present with mild degenerative changes of the thoracic spine . Old right - sided rib fractures are noted .
    OUTPUT:
    
Mild bibasilar atelectasis .