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Illustration of the vertical section of Bonfils intubation fiberscopy. In this case, intubation was impossible because the endotracheal tube was stuck between the teeth and shaft of the scope when the operator tried to visualize the vocal cords (the proximal part must be pushed down towards the direction of arrow to lift up the distal end of the scope). The intubation was subsequently achieved with flexible fiberoptic bronchoscopy.
