Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal portable radiograph of the chest demonstrates unchanged mild cardiomegaly . Tortuosity of the thoracic aorta and aortic knob calcifications are also stable . No pleural effusion or pneumothorax . Contrast is seen within the colon likely from a recent prior barium study . The lungs are clear .
    OUTPUT:
    
Stable appearance of the chest with no acute process .