| Objective The clinical classification in base of tongue cancer is an important factor for local recurrent, nodal metastasis, and patient survival. An accurate preoperative assessment is therefore essential for optimal treatment planning. The aim of our study was to evaluate the accuracy of MRI findings in the clinical classification and the maximum diameter of the cancer in root of tongue, and evaluate the relationship between the maximum diameter and lymph node metastasis rate.Methods There are 19 patients with cancer in root of tongue. All the patients underwent preoperative type-B ultrasonic and MRI. After surgery, the glossectomy specimens were measured immediately. The radiologic tumor was classified with UICC TNM classification of malignant tumors.Results MRI suggested the sensitivity of 94.7% for the diagnosis of the malignant tumors (18/19).The sensitivity of TNM classification using MRI was 84.2%. The radiologic maximum diameter on tumor had no significant difference with the actual (R= 3.53±0.405,3.45±0.424cm, P >0.05, respectively). When the MRI showed the maximum diameter greater than or equal to 2cm, the patient's lymph node metastasis rate was 80.0%, when the maximum diameter less than 2cm, the lymph node metastasis rate was 25.0%, there was a significant difference between the two groups. The sensitivity of MRI in lymph node metastasis was 85.7%, accuracy 84.2%, The sensitivity of type-B ultrasonic was 92.8%,, accuracy 94.7%, P>0.05, there was no significant differences between the two groups.Conclusion (1)MRI should be a good choice in the diagnosis of base of tongue cancer, (2)The maximum diameter on MRI could be employed to estimate the possibility of lymph node metastasis, (3) CT and type-B ultrasonic could be used as a compensation if in case.
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