Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal and lateral chest radiograph demonstrates unremarkable mediastinal and hilar contours . Heart size is top normal . Lungs are clear . No pleural effusion or pneumothorax present . Mild indentation of right tracheal contour may be due to enlarged thyroid .
    OUTPUT:
    
No acute intrathoracic process . Rightsided indentation of thyroid may be due to enlarged thyroid . Correlate with clinical exam .