Pathologically Proven Level IIb Lymph Node Metastasis in Head and Neck Cancer: A Preliminary Report / 대한이비인후과학회지

ABSTRACT

BACKGROUND AND OBJECTIVES: The spinal accessory nerve dysfunction is a serious sequela following selective neck dissections despite preservation of the spinal accessory nerve. The incidence of this complication is known to be 20%-30% and the primary cause of nerve dysfunction is known as significant traction during resection of level IIb lymph node group. To try to answer whether level IIb could be preserved, we evaluated the incidence of metastasis to level IIb lymph node from various types of the head and neck cancer. MATERIALS AND METHODS: Sixty patients who underwent surgery for their head and neck cancer as an initial treatment from February 1999 to July 2000 were prospectively evaluated. Histopathological evaluations for 106 neck dissection specimens were performed in 60 patients with the head and neck cancer. RESULTS: A total of 7 patients (11.7%) had metastasis to level IIb lymph node. All but one case had ipsilateral level IIb metastasis. All seven cases had multiple lymph node metastases to other levels, including level I, IIa, III, IV, or V. Occult metastasis to level IIb was noted in one case of 25 clinically proven N0 head and neck cancer patients (4%). Primary sites and pathologies with level IIb metastasis were varied, including such sites as upper eyelid, parotid gland, or thyroid gland. CONCLUSIONS: This preliminary report reveals low incidence of level IIb metastasis in some of clinically proven N0 head and neck cancer. Contralateral level IIb lymph node could be preserved in clinically proven N0 heasd and neck cases. Multiple lymph node metastases increase the probability of metastasis to level IIb. Level IIb resection is necessary in clinically proven N+ cases with multiple nodes or multiple levels of metastases. Also, Level IIb metastasis may tend to increase in some of the primary sites, which drain into the jugular chain via level IIb lymph node.