Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright radiograph was obtained . The lungs are well expanded and clear with elevation of the left hemidiaphragm . No pneumothorax or pleural effusion is seen . The heart is normal in size with normal mediastinal contours . Surgical clips project over the neck compatible with known history of thyroidectomy . No displaced rib fractures are identified .
    OUTPUT:
    
No acute intrathoracic process .