The bronchial stump insufficiency after lung resection specially after pneumonectomy is known as a dangerous complication. The occlusion of an experimentally produced bronchial stump fistula after pneumonectomy on the left succeeded in all cases (n = 7) by means of a fibrin adhesive. The adhesive was applied in the endoscopic way by a plastic catheter. This method appeared to us as the treatment of choice for the so-called early fistulas. This method was applied successfully in one clinical case.