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Fig. 5B. —14-year-old boy (A) and 46-year-old man (B) with nasopharyngeal carcinomas. Axial contrast-enhanced CT scans show neck at level just below skull base. Sagittal black line has been drawn along medial aspect of right internal carotid artery (C). Note retropharyngeal necrotic node (R) medial to this line. Also note necrotic high level II node (A), which can be subclassified as level IIA node because it is inseparable from carotid sheath.