Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates extensive opacification involving much of the right hemithorax , which likely represents a combination of asymmetric pulmonary edema and pneumonia . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax .
    OUTPUT:
    
Extensive opacification involving much of the right hemithorax is grossly unchanged , and likely represents a combination of asymmetric pulmonary edema and pneumonia .