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Fig. 1D. —Recurrent enlargement of adenoid tonsils in 10-year-old girl with Down syndrome and persistent obstructive sleep apnea despite previous tonsillectomy and adenoidectomy. A = adenoid tissue. Consecutive images from sagittal cine MRI sequence show enlarged adenoid tissue. Posterior nasopharynx (large arrow) and hypopharynx (small arrows, E) are well-defined and show low signal in D and are poorly defined and show high signal in E. Cine display of images showed intermittent collapse of nasopharynx and hypopharynx.