Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . The lungs are clear with interval resolution of right middle lobe opacity . There is no pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
No acute cardiothoracic process .