Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Elevation of the left hemidiaphragm is causing some rightward displacement of the heart . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax . Opacity in the lingula may represent pneumonia or pulmonary infarct .
    OUTPUT:
    
Lingular opacity may represent pneumonia or pulmonary infarct .