Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal with mildly tortuous aorta . The mediastinal silhouette and hilar contours are unremarkable . The lungs are clear . There is no pleural effusion or pneumothorax . The osseous structures are grossly unremarkable .
    OUTPUT:
    
No acute intrathoracic process .