From: Assessment of cervical lymph node metastasis for therapeutic decision-making in squamous cell carcinoma of buccal mucosa: a prospective clinical analysis
Frequency
Percentage
Level I
40
66.7%
Levels I, II
13
21.7%
Levels I, II, III
5
8.3%
Levels I, II, III, and IV
2
3.3%
Total
60
100%