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Fig. 2A. —Recurrent enlargement of adenoid tonsils in 7-year-old boy with Down syndrome and persistent obstructive sleep apnea despite previous tonsillectomy and adenoidectomy. Consecutive images from cine MRI sequence show enlarged adenoid tissue (A on A). In A, nasopharynx (small arrow) and hypopharynx (large arrows) are patent. In B, nasopharynx (small arrows) and hypopharynx (large arrows) have decreased in caliber and are nearly collapsed. Cine display of images showed intermittent collapse of nasopharynx and hypopharynx.