Figure 3 Legend

Figure 3: Level II Lymph Nodes

Figure 3A

A. The superior margin of the Level II lymph nodes is formed by the skull base jugular foramen. (arrow)

Figure 3B

B. The lower margin is formed by the hyoid bone. (arrow)

Figure 3C

C. The Level II nodes are located anterior to a transverse line connecting the posterior edge of the sternocleidomastoid muscles (long line) and posterior to a transverse line connecting the posterior edge of the submandibular glands (small line).

Figure 3D

D. Level IIA nodes are situated anterior, medial or lateral to the internal jugular vein (arrow) whereas Level IIB nodes are posterior to the internal jugular vein and have an identifiable fat plane between the lymph node and the vein (arrowheads).