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Fig. 2D. —Intraluminal mass and soft tissue in tracheal cartilage on MR images in 57-year-old woman with papillary thyroid carcinoma. Photomicrograph of surgically resected specimen shows tumor extension to submucosal areas (arrowheads) through intercartilaginous portion (arrow). Epithelium of mucous membrane (open arrows) and tracheal cartilage (C) are preserved. TL = tracheal lumen. (H and E, x 4)