Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Elevation of the right hemidiaphragm is of unknown chronicity . Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Atelectasis in the right lung base is noted . No focal consolidation , pleural effusion or pneumothorax is detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Elevation of the right hemidiaphragm , of unknown chronicity .