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©2013 UpToDate ® Print Email Volumetric reconstruction of axial MR images in a normal subject and patient with sleep apnea The mandible is depicted in white, the tongue in red, the soft palate in blue, the lateral parapharyngeal fat pads in yellow, and the lateral/posterior pharyngeal walls in green. The airway is depicted in gray/white. The normal subject has a larger airway than the patient with sleep apnea. The tongue, soft palate, parapharyngeal fat pads, and lateral pharyngeal walls of the patient with sleep apnea are all larger than in the normal subject. Courtesy of Richard J Schwab, MD.