Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable AP radiograph of the chest demonstrates clear lungs and normal hilar and cardiomediastinal contours . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . Left lower lobe mass seen on subsequent CT is not visible on this study .
    OUTPUT:
    
No acute cardiopulmonary process . See subsequent CT for more complete evaluation .