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Fig. 2B. —44-year-old man with lymphoma. ad = anterior belly of digastric muscle, S = submandibular gland, vn = internal jugular vein, Sc = sternocleidomastoid muscle. Axial contrast-enhanced CT scan of neck through floor of mouth and at level of hyoid bone. Because level is cranial to that of bottom of body of hyoid bone, internal jugular nodes are classified as level II, not level III. On each side of neck, transverse white line (Ant) has been drawn through posterior edge of each submandibular gland. Second white line (Post) has been drawn through posterior edge of each sternocleidomastoid muscle. Nodes anterior to line (Ant) are level I nodes. Nodes between line (Ant) and line (Post) are level II nodes. Nodes posterior to line (Post) are level V nodes. Because level V nodes are cranial to level of bottom of body of cricoid cartilage arch, they are subclassified as level VA nodes.