Table 2.

Classification of neck dissections (ref. no.: 24)

1991 classification	2002 classification
1. Radical neck dissection	1. Radical neck dissection
2. Modified radical neck issection	2. Modified radical neck dissection
3. Selective neck dissection	3. Selective neck dissection (SND): all types are named as SND. Removed lymph groups or subgroups are written in parenthesis
a. Supraomohyoid (Groups I, II, and III)
b. Lateral (Groups II, III, and IV)
c. Posterolateral (Groups II, III, IV, and V)
d. Anterior (Group VI)
4. Extended radical neck dissection	4. Extended radical neck dissection