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Fig. 3. —36-year-old HIV-positive man. Axial contrast-enhanced CT scan of neck through level of lower mandible and above hyoid bone shows level IA node between medial margins of anterior bellies of digastric muscles (ad). Level IB nodes are lateral to level IA nodes and anterior to back of submandibular glands (S). Levels IIA and IIB nodes are seen bilaterally. v = internal jugular veins, Sc = sternocleidomastoid muscles.