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Boundaries of Level I nodes:
- Above hyoid bone
- Below mylohyoid muscle
- Anterior to a traverse line drawn through the posterior edge of the SMG
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Boundaries of Level IA nodes:
- Between medial margins of anterior bellies of the digastric muscles
- (Former name: Submental nodes)
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Boundaries of Level IB nodes:
- Posterior and lateral the medial edge of the anterior belly of the digastric muscle
- Anterior to the posterior edge of the SMG
- (Former name: Submandibular nodes)
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Boundaries of Level II nodes:
- From skull base to the lower body of the hyoid bone
- Anterior to the posterior edge of of the SCM
- Posterior to the posterior edge of the SMG
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Boundaries of Level IIA nodes:
- Anterior, lateral, or medial to the IJV
- OR lie posterior to the IJV and are inseparable from it
- (Former name: Upper internal jugular nodes)
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Boundaries of Level IIB nodes:
- Lie posterior to the IJV and have a fat plane separating the nodes and the vein
- (Former name: Upper spinal accessory nodes)
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Boundaries of Level III nodes:
- Between the lower body of the hyoid bone and the lower margin of the cricoid arch
- Anterior to the posterior edge of the SCM
- Lateral to the medial margin of the CCA/ICA
- (Former name: Mid-jugular nodes)
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Boundaries of Level IV nodes:
- Between the lower margin of the cricoid cartilage arch and the level of the clavicle
- Anterior and medial to an oblique line drawn between the posterior edge of the SCM and the posterolateral edge of the anterior scalene muscle
- Lateral to the medial margin of the CCA
- (Former name: Low jugular nodes)
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Boundaries of Level V nodes:
- From the skull base at the posterior border of the attachment of the SCM to the clavicle
- Anterior to the anterior edge of the trapezius muscle
- Posterior to the posterior edge of the SCM (skull base to bottom of cricoid)
- OR posterior and lateral to an oblique line through the posterior edge of the SCM and the posterolateral edge of the anterior scalene muscle (bottom of cricoid to clavicle)
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Boundaries of Level VA nodes:
- From skull base superiorly to lower margin of cricoid cartilage inferiorly
- (Former name: Upper posterior cervical nodes)
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Boundaries of Level VB nodes:
- From lower margin of cricoid cartilage to level of clavicle
- (Former name: Lower posterior cervical nodes)
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Boundaries of Level VI nodes:
- Inferior to the body of hyoid, superior to the top of manubrium
- Between the medial margins of the ICAs/CCAs
- (Former name: Visceral nodes)
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Boundaries of Level VII nodes:
- Caudal to the top of the manubrium in the superior mediastinum
- Between the medial margins of the left and right common carotid arteries
- Superior to the innominate vein
- (Former name: Superior mediastinal)
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