Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear but hyperexpanded and the cardiac and mediastinal contours are normal . Intact median sternal wires are noted . Loop recorder is seen overlying the left heart border . No pleural effusion or pneumothorax . Osseous structures are unremarkable with no evidence of rib fracture or thoracic spine abnormality .
    OUTPUT:
    
No acute cardiopulmonary process .