Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . Lungs are clear . No signs of pneumonia or CHF . No effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Previously noted central venous catheter is been removed . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic findings .