Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright radiograph demonstrates patchy opacity at the left lower lung zone which may reflect aspiration or alternatively atelectasis . Lungs are otherwise clear with no focal opacity convincing for pneumonia . Vascular congestion and distended azygos vein are noted , and potentially might represent volume overload , mild Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . No air under the right hemidiaphragm is visualized . No large pleural effusion is seen . Osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
No air under the right hemidiaphragm . Patchy opacity at the left lower lung zone may reflect aspiration or alternatively atelectasis . Mild volume overload .