Radical neck dissection
Refers to the removal of all lymph node groups extending from the inferior border of the mandible superiorly to the clavicle inferiorly, from the lateral border of the sternohyoid muscle, hyoid bone, and contralateral anterior belly of the digastric muscle medially, to the anterior border of the trapezius muscle laterally. Included are all lymph nodes from levels I-V with sacrifice of internal jugular vein, sternocleidomastoid muscle, and spinal accessory nerve.
Extended Radical Neck Dissection
Refers to the removal of one or more additional lymph node groups or non-lymphatic structures or both, not encompassed by the radical neck dissection.
Modified radical neck dissection
Refers to the removal of all lymph nodes by radical neck dissection with preservation of one or more of the non-lymphatic structures: i.e., the spinal accessory nerve, internal jugular vein and the sternocleidomastoid muscle.
Selective neck dissection
Refers to any type of cervical lymphadenectomy where there is preservation of one or more of the lymph node groups removed by the radical neck dissection. The types of selective dissections are described below.
Supraomohyoid Neck Dissection
Refers to the removal of ly