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Fig. 4A. —Extensive tumor circumference around trachea is seen on MR images in 80-year-old woman with papillary thyroid carcinoma. Unenhanced T1-weighted image (TR/TE, 900/15; excitations, 1) shows hypointense thyroid tumor (arrowheads) in right lobe, isthmus, and part of left lobe of thyroid gland that encroaches greater than 180° of the tracheal circumference (black arrows). Calcification (white arrow) is seen in the tumor.