Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates well - expanded clear lungs . All cardiac and mediastinal contours are normal and there is no increase in mediastinal density to suggest the presence of thymoma . There is no pneumothorax , consolidation or pleural effusion .
    OUTPUT:
    
Normal chest x-ray examination . No pneumonia or thymoma .