Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pacemaker with right atrial and right ventricular leads is appropriately positioned . The lungs are clear . Mild cardiomegaly is unchanged . Unchanged mild blunting of the right costophrenic angle may be an a tiny pleural effusion or scarring . The mediastinal contours are normal . There is no pneumothorax . Anterior wedging of a lower thoracic vertebral body is unchanged .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Stable mild cardiomegaly . 3 . Unchanged blunting of the right costophrenic angle is either a tiny effusion or scarring .