[A rare cause of accidental selective intubation: right upper lobar bronchus originating from the trachea]

A case of accidental selective intubation of a right upper lobar bronchus originating from the trachea, in a woman with a normal preoperative chest X-ray, is reported. The preoperative diagnosis of an asymptomatic tracheal bronchus is often difficult on a standard chest X-ray, especially since a chest X-ray is no longer systematically included in the preanaesthetic assessment. Therefore, the presence of a bronchial malformation should be considered as a cause of ventilatory problems, particularly those occurring after tracheal intubation.