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Fig 1. Carotid encasement; adenoid cystic carcinoma. A, Note the circumferential involvement of the left cavernous artery by a soft-tissue mass with narrowing of the carotid artery in this patient who had adenoid cystic carcinoma from the sinonasal cavity. B, This patient also demonstrates erosion of the clivus with bony infiltration of the skull base.
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