Role of Computed Tomography Imaging in Evaluation Cervical Lymph Nodes in Patients with Nasopharyngeal Carcinoma Computed Imaging in Evaluation Cervical Lymph Nodes in with

mаle to-femаle rаtio of 2-3:1 common аmong pаtients 40-60 yeаrs old with bimodаl аge peаks in the second аnd sixth decаdes of Eаrly detection, eаrly diаgnosis, аccurаte stаging аnd evаluаtion аfter treаtment the key to improve the efficаcy of treаtment аnd


Results
The 141 pаtients included in this аnаlysis comprised men account for 75,9%, with а mediаn аge аt diаgnosis of 49 yeаrs (rаnge, 20-88 yeаrs). There were 119 patients found with cervical lymph nodes on CT scan (both sides in 70 patients), accounting for 84.4%. Retropharyngeal space lymph nodes is present in 55 (39%) of the total number of 141 patients with nasopharyngeal cancer, supraclavicular lymph nodes accounting for 1.4%.Of these cervical lymph nodes, above carotid lymph nodesaccount for a high percentage (92,4%) ( Table 1). The size of cervical lymph nodes from 2cm to less than 4cm accounts for a high proportion (54.6%), the size of lymph nodes under 1cm is only 0.8% and over 6cm is Table 2). The period of neck lymph nodes N2 accounts for the highest proportion of 48.9%, the period of N3 is 4.3% and without neck lymph nodes is 15.6% (Table 3)

Discussion
According to our  [26]. The study results of the author Ngo Huu Thuan showed that the ratio of bilateral neck lymph nodes accounted for 82.4% [19]. According to author Mao Y.P, neck lymph nodes on both sides account for 55.2% [23].According to the results of Table 3, neck lymph nodes with a size of 2-4cm account for 54.6% of the total number of lymph node findings.
According to the results of author Mao Y.P, neck lymph node size from 2-4cm accounts for 46.9% [23]. According to the research results of the author Ngo Huu Thuan, the 1-3cm neck lymph nodes account for the highest proportion with 58.8% [19].According to AJCC grading, retropharyngeal space lymph nodes present on one or both sides are classified into N1 and above [26]. The presence of a retropharyngeal space lymph node is the first marker of regional metastatic ability of palate cancer [24,27]. of the retropharyngeal space lymph nodes [24].The supraclavicular lymph node is one of the markers for the N3 stage of regional lymph node metastasis of nasopharyngeal cancer [26]. The results of our study showed that the supraclavicular lymph nodes accounted for 1.4%. According to the results of Ngo Huu Thuan and Ho F.C.H, the incidence of supraclavicular lymph nodes is 9.8% and 3% [19,24].
According to our research results in Table 3 [19].
According to Phung Hung, the period of N0-N1 accounted for 35.48%, the period of N2 was 48.39% and the period of N3 was 16.13% [18]. According to the author Kim J.H and Lee J.K on CT scan, metastatic neck lymph nodes in N0-N1 stage accounted for 58%, N2 stage was 35% and N3 stage was 7% [28]. The results on the comparison table of metastatic neck lymph nodes on CT scan, our study agreed with the authors on the period N2 accounted for the highest proportion. Our N3 stage is lower than the rest of the authors, possibly due to the large size of the lymph nodes or the late stage of cancer of the nasopharynx so the treatment is not merely radiotherapy so we cannot give it to form.