Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax though the extreme inferior aspect of the right costophrenic sulcus is excluded on the lateral view . The heart is normal in size with unchanged tortuous and slightly enlarged thoracic aortic contour .
    OUTPUT:
    
No acute intrathoracic process .