Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright portable radiograph of the chest demonstrates elevation of the right hemidiaphragm and overall low lung volumes . The heart size is accentuated by low lung volumes , but is top normal in size . There is no pneumothorax , pleural effusion , pulmonary edema , or focal airspace opacity . No subdiaphragmatic free air is identified .
    OUTPUT:
    
No free air . No acute pulmonary process .