Figure 10a. Sagittal gradient-echo cine MR images (8200/3600, 80° flip angle, 12-mm section thickness, 128 images) show glossoptosis in 8-year-old boy with persistent obstructive sleep apnea despite previous tonsillectomy and adenoidectomy. (a) At one point during the respiratory cycle, the hypopharynx is patent, with the posterior aspect of the tongue (arrow) separated from the posterior wall of the hypopharynx. (b) At anther point during the respiratory cycle, the posterior aspect of the tongue has moved posteriorly, collapsing the hypopharynx (arrows) and displacing the soft palate posteriorly (arrowhead).