Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature normal . The left hemidiaphragm appears elevated posteriorly No focal consolidation , pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Posterior elevation of the left hemidiaphragm , of unknown chronicity .