Abstract: There have recently been few reports on the significance of the lymph node metastasis between sternocleidomastoid and sternohyoid muscle (LNSS). As reported, the incidence of LNSS metastasis is 7.4%-23.5%. Because of its anatomical location, it is easy to overlook LNSS in the cervical lymph node dissection. Deepening of LNSS cognition is of great clinical significance for the full exposure of relevant areas and the thorough removal of the lymph nodes during surgery. This article introduces the concept of LNSS and reviews the current research about it.

Key words: Lymph node metastasis, Papillary thyroid cancer, The lymph node between sternocleidomastoid and sternohyoid muscle, Cervical lymph node dissection