Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Possibly calcified hilar nodes are identified . Lung volumes are low ; however , lungs are clear . No pleural effusion or pneumothorax is present . No osseous abnormalities are identified .
    OUTPUT:
    
No acute intrathoracic process .