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Level 1- 10%. Level 2- 75%. Level 3- 51.7%. Level 4- 13.5% . Level 5- 1%. Moreover the anatomic location of lymph nodes involved with metastatic tumor provides an important indication of the site of primary tumor. Such examples are as below: Lymphnode with metastatic tumor. Lymphnode with primary tumor. High cervical group. Head and neck region ... ................
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