Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low but clear . There is no focal consolidation or pneumothorax . There is no vascular congestion or pleural effusions . Cardiomediastinal and hilar contours are within normal limits . There is mild elevation of the left hemidiaphragm . A severe hiatal hernia is noted . Bilateral humeral prostheses are incompletely evaluated , but appear in standard position .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Severe hiatal hernia . 3 . Bilateral humeral head prostheses , incompletely evaluated .