Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No definite fracture . The lungs are grossly clear . There is no pleural effusion or pneumothorax . There is moderate - to - severe cardiomegaly and a tortuous aorta . There are aortic knob calcifications . There is no mediastinal contour abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .