Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slight elevation of the right hemidiaphragm persists . Lung volumes are low . No pleural effusion , pneumothorax or focal airspace consolidation . Heart remains mildly enlarged , unchanged from ___ . Mediastinal and hilar structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .