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Fig. 2A. —Adenoid cystic carcinoma in 60-year-old man. Unenhanced
transaxial CT scan (3-mm collimation) at level of distal trachea that was
obtained using mediastinal window settings shows lobulated and broad-based
intraluminal soft-tissue tumor (arrow) in anterolateral aspect of
distal trachea. Also note marked wall thickening (arrowheads). More
than 180° of circumference is involved.
