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CT - CT of the neck
Non-enhancing, tubular/multicystic, multicompartmental, fluid-density structure extending from the left supraclavicular region and inferiorly to the left paraesophageal (posterior mediastinum) region to the level of the aortic arch. The lesion is displacing the sternocleidomastoid muscle/internal jugular vein anteriorly and the trachea/esophagus to the right.