Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . The lungs are clear . There is no effusion . Cardiomediastinal silhouette is stable , noting retrocardiac opacity compatible with a hiatal hernia . Lower thoracic acute kyphosis is again seen ; however , delineation of the distinct vertebral bodies is difficult due to overlying soft tissues and osteopenia .
    OUTPUT:
    
No acute cardiopulmonary process .