Pneumothorax induced by the incorrect insertion of a nasogastric tube An 85-year-old woman received exchange of a nasogastric tube (NGT) by insufflation with air, and auscultation at the epigastric area was considered equivocal by a young physician. Radiographic confirmation revealed incorrect insertion of the NGT into the left tracheobronchial tree and then the NGT was removed (Fig. 1, left panel). The next day, chest X-ray and subsequent computed tomography revealed complication of left pneumothorax (Fig. 1, right panel). She required thoracostomy by insertion of a drainage tube. Incorrect insertion of tubes into the tracheobronchial tree occurs in 0.3-15% of cases. 1 Pneumothorax has also been reported. 1 Two methods for confirming the position of the NGT are currently recommended: 2 chest X-ray and a pH test. Confirmation of the position of the NGT by X-ray is the gold standard method. If an X-ray cannot be obtained quickly, then a pH test is carried out. If the pH of the aspirate from the NGT is ≤5, then feeding can be started. If the pH of the aspirate is ≥6 or if no gastric aspirate is obtained, then a chest radiograph needs to be obtained to determine the NGT placement. Other methods, such as insufflation, can be inaccurate and should not be used. 1,2 In addition, the physician should be more careful when they feel resistance during gastric tube insertion.