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Illustration of cephalometric measurements for upper airway. Upper pharyngeal width (UPW): linear distance from a point on the posterior wall of the soft palate (the anterior half part) to the posterior pharyngeal wall where there was the greatest closure of the airway. Lower pharyngeal width (LPW): measured from an intersection point of the posterior border of the tongue and the lower border of mandible to the closest point on the posterior pharyngeal wall.
