Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made with the next preceding PA and lateral chest examination ___ ___ . Mild cardiac enlargement as before . Unchanged general widening and elongation of the thoracic aorta with walled calcifications . No significant interval change . The pulmonary vasculature is not congested , and there are no signs of new acute pulmonary parenchymal infiltrates in comparison with the previous study . A tracheostomy has been performed , and the cannula is seen to terminate in the trachea some 6 cm above the level of the carina . No pneumothorax has developed . The portable chest examination does not demonstrate any suspicious contours that would indicate a pneumomediastinum . The NG tube of Dobbhoff type has been advanced that reaches well below the diaphragm .
    OUTPUT:
    
Successful tracheostomy without evidence of pneumothorax . Dobbhoff line reaches well into the stomach .