Fig 2

Retrolingual space of one patient undergoing SCPL before the surgery (a) and 3 month after extubation (b). Retropalatal (c) and retrolingual (e) space during the end of quiet respiration; Retropalatal (d) and retrolingual (f) space during Mueller’s maneuver with one patient undergoing SCPL. Retrolingual space in the expiratory phase (g) and aspirated phase (h) with one patient undergoing VPL