Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrate low lung volumes with subsequent bibasilar atelectasis and crowding of the vasculature . No focal consolidation convincing for pneumonia is present . There is no large pleural effusion or pneumothorax . Cardiomediastinal and hilar contours are within normal limits . Calcifications involve the aortic arch .
    OUTPUT:
    
No acute intrathoracic abnormality . Low lung volumes with bibasilar atelectasis .