Editing Neck dissection (section)

==Classification of neck dissections==
The 2001 revisions proposed by the American Head and Neck Society (AHNS) and the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) are as follows.
# Radical Neck Dissection ('''RND''') – removal of all [[ipsilateral]] cervical lymph node groups from levels I through V, together with SAN, SCM and IJV.
# Modified Radical Neck Dissection ('''MRND''') – removal of all lymph node groups routinely removed in a RND, but with preservation of one or more nonlymphatic structures (SAN, SCM and IJV).
# Selective Neck Dissection ('''SND''') (together with the use of parentheses to denote the levels or sublevels removed) – cervical [[lymphadenectomy]] with preservation of one or more lymph node groups that are routinely removed in a RND. Thus for oral cavity cancers, SND (I–III) is commonly performed. For oropharyngeal, hypopharyngeal and laryngeal cancers, SND (II–IV) is the procedure of choice.
# Extended Neck Dissection. This refers to removal of one or more additional lymph node groups or nonlymphatic structures, or both, not encompassed by the RND.