Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are noted with secondary crowding of the bronchovascular markings . Lungs are otherwise clear . There is a moderate hiatal hernia . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Moderate hiatal hernia . No definite acute cardiopulmonary process .