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Figure 5b. Recurrent and enlarged adenoids in a 9-year-old girl with obstructive sleep apnea despite previous adenoidectomy. (a) Sagittal midline fast SE IR MR image (5000/34, echo train length of 12, 22-cm field of view, 6-mm section thickness with 2-mm gap, 256 x 192 matrix, two signals acquired) shows recurrent and enlarged adenoids (A), which encroach on the nasopharynx. (b, c) Transverse gradient-echo cine MR images (8200/3600, 80° flip angle, 12-mm section thickness, 128 images) obtained at level of base of the tongue. (b) At one point during respiratory cycle, airway (*) is patent. (c) At another point during respiratory cycle, airway shows cylindric collapse (arrows) with anterior, posterior, and lateral walls of hypopharynx having moved centrally.
