Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph is obtained . The patient 's chin partially obscures the lung apices . The lungs appear clear without focal consolidation , effusion , or definite signs of pneumothorax . Cardiomediastinal silhouette appears normal . The imaged osseous structures appear intact . No definite signs of free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .