The change of CT and US findings of cervical lymphadenopathy in oral squamous cell carcinoma before and after preoperative chemoradiotherapy.

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One of the major determinants of treatment planning and prognosis of oral cancer is whether or not metastatic cervical lymph node involved before treatment. The criteria of cervical lymph node metastasis be performed by CT (computed tomography) and US (ultrasonography) was suggested. The criteria were as follows ; 1. Definitely or probably metastasis 2. Definitely or probably non-metastasis 3. Questionable "Questionable"lymph node are often experienced in the clinic. The purpose of this study was to examine those"questionable"lymph nodes and to evaluate the change of CT and US findings of cervical lymphadenopathy before and after preoperative chemoradiotherapy. Thirty-four cervical lymph nodes (13 metastasis, 21 non-metastasis), which could not be diagnosed whether or not metastasis using the diagnostic criteria of CT and US before preoperative chemoradiotherapy, were evaluated retrospec-tively. CT and US images before preoperative chemoradiotherapy were compared with those after preoperative chemoradiotherapy. Metastatic lymph nodes increased internal echoes and/or decreased more than 4 mm in short diameter on US image by preoperative chemoradiotherapy. It was considered that the change of US findings before and after preoperative chemoradiotherapy was useful for differentiating metastasis from non-metastasis.
一般社団法人日本口腔腫瘍学会の論文