Distribution of lymph node metastasis from lymphoepithelial-like carcinoma of the parotid
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LiNa Yin1,*, Xue Huang2,*, XiaoLan Liu3, YongChun Zhang4 and Xiaoshen Wang1
1Department of Radiation Oncology, Fudan University Shanghai Cancer Center, and Department of Oncology, Shanghai Medical College of Fudan University, China
2Department of Radiation Oncology, Changzhou Tumor Hospital, Soochow University, Changzhou, China
3Department of Radiation Oncology, The Second Affiliated Hospital of Jilin University, Changchun, China
4Department of Radiation Oncology, The Affiliated Hospital of Qingdao Medical College, Qingdao University, Qingdao, China
*These authors contributed equally to this work
Xiaoshen Wang, email: [email protected]
Keywords: lymphoepithelial-like carcinoma (LELC), parotid gland, cervical lymph nodes
Received: January 01, 2016 Accepted: June 29, 2016 Published: August 02, 2016
Purpose: To explore the distribution of node spread from lymphoepithelial-like carcinoma (LELC) of the parotid gland based on the 2013 updated guidelines for neck node levels.
Results: 42 (58.3%) cases had metastatic nodes, all were localized at the ipsilateral neck. The detailed distribution was: level Ia 0, level Ib 6(14.3%), level II 34 (80.1%), level III 16 (38.1%), level IV 9 (21.4%), level V 7 (16.7%), level VI 0, level VII 0, level VIII 37 (88.1%), level IX 0, level Xa 2 (4.8%), and level Xb 0. Lymphadenopathy in level Ib, V and Xa was always accompanied with level II or level VIII nodal metastasis. No statistical significance was found in the incidence of nodal involvement between T1-2 and T3-4 tumors (57.4% versus 61.1%, p = 0.78).
Methods: We retrospectively reviewed the surgical and imaging documents of 72 cases of LELC from the parotid gland between January 2004 and November 2015. All patients received contrast enhanced computed tomography (CT) or magnetic resonance imaging (MRI). Parotid metastasis from nasopharyngeal cancer (NPC) was excluded. Nodal status and distribution was evaluated by both pathologic reports and imaging studies.
Conclusions: This is the first description of topography of cervical nodal metastases from LELC of the parotid gland. Incidence of nodal involvement is high. Nodes at ipsilateral level VIII and II were most frequently involved, followed by level III, IV, V and Ib. Nodes in level Ia, VI and level VII were rarely seen.
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