Neck Lymph Node Boundary Level IV

**Semantic type:** Finding

**Definition:** The following anatomical structures define the neck lymph node boundary for level IV: Superior: horizontal plane defined by the inferior border of the cricoid cartilage; inferior: clavicle; anterior (medial): lateral border of the sternohyoid muscle; posterior (lateral): lateral border of the sternocleidomastoid or sensory branches of the cervical plexus. (AJCC 8th ed.)

**Synonyms:** - CERVICAL LYMPH NODE LEVEL IV