Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates moderately well inflated clear lungs . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the osseous structures demonstrates no displaced rib fracture .
    OUTPUT:
    
No acute cardiopulmonary process . No displaced rib fracture .