Study participants
Medical records of patients diagnosed with oral tongue cancer and
cervical lymph node metastasis between January 2011 and December 2016
were reviewed. The inclusion criteria were as follows: 1) diagnosed with
oral tongues cancer with cervical lymph node metastasis between January
2011 and December 2016; 2) had the pre-operative CT or MRI scans
compatible with the Eclipse application (Version 15.6.05, Varian
company); and 3) had the characteristics of lymph node metastasis
including short-axis diameter of >1 cm, necrotic/cystic
content, irregular border, and matted lymph node. The study excluded
patients younger than 18 years old or non-Thais.