Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiographs from ___ , there is persistent elevation of the right hemidiaphragm . Increased focal opacity at the right lung base likely reflects atelectasis as it has not significantly changed since prior examination from ___ . No focal abnormality to suggest pneumonia is identified . There is no large pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
No acute cardiopulmonary process . Recent development of elevated right hemidiaphragm , could be secondary to diaphragmatic injury or phrenic palsy .