Lymphatic drainage map of the head and neck skin squamous cell carcinoma detected by sentinel lymph node biopsy

OBJECTIVE: Squamous cell carcinoma of the skin often affects the scalp and neck region and has a potential for complex lymphatic metastases. The aim of this study was to examine the pattern of lymphatic drainage that would enable better insight and prediction of lymphatic metastasis of head and neck squamous cell carcinoma (HNSCC) in relation to the anatomical localization of the primary process. PATIENTS AND METHODS: A prospective analysis included 64 patients who underwent sentinel lymph node (SLN) biopsy. The biopsy was performed in patients with high- risk cutaneous head and neck squamous cell carcinoma between 2006 and 2010. RESULTS: SLNs in tumors of the forehead, temporal region, lateral cheek, and auricle were found in the cervical region at level II and parotid lymph nodes (p<0.001). In tumors of the nose, periorbital region, and postauricular tumors, SLNs were found in parotid lymph nodes (p<0.001), in tumors of the medial cheek in level I cervical lymph nodes and parotid lymph nodes (p=0.003). In tumors of the neck, SLNs were detected in the cervical region at level IV, whereas in tumors of the posterior scalp they were found in the occipital region (p<0.001). CONCLUSIONS: The results of SLN biopsy in high-risk cutaneous HNSCCs show the regularity of metastasis based on which a lymphatic drainage map can be constructed and thus potential metastatic sites depending on the primary tumor localization predicted.