Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lungs are clear . Mild elevation of the right hemidiaphragm may be due to a small subpulmonic effusion or subdiaphragmatic process if acute , though the chronicity of this finding is unknown without prior imaging . No left - sided pleural effusion is demonstrated . There is no pneumothorax . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild elevation of the right hemidiaphragm , of unknown chronicity . This could be due to a small subpulmonic effusion or subdiaphragmatic process if acute .