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When Should Elective Neck Dissection Be Performed for Parotid Gland Malignancy?

by Ameya Asarkar, MD; Brent A. Chang, MD; and Cherie-Ann O. Nathan, MD • January 15, 2021

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TRIO Best PracticeTRIO Best Practice articles are brief, structured reviews designed to provide the busy clinician with a handy outline and reference for day-to-day clinical decision making. The ENTtoday summaries below include the Background and Best Practice sections of the original article. To view the complete Laryngoscope articles free of charge, visit Laryngoscope.

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January 2021

Background

Salivary gland cancers are rare, with an incidence of about 1.3 per 100,000. Surgery is the treatment of choice for the primary as well as clinico-radiologically positive metastasis to the neck (cN+), followed by radiotherapy, depending upon the high-risk features on final histopathology. In contrast to oral cavity carcinoma, treatment of the regional metastasis to the neck has not been clearly defined in node-negative necks (cN0). Approximately 28 histological subtypes of salivary gland carcinoma have been identified. Due to the relative rarity of these cancers and heterogenous histopathology, it is difficult to standardize the treatment algorithm for each of these subtypes. Randomized controlled trials with different protocols are not feasible for the same reasons.

Best Practice

Parotid gland malignancies are rare. Parotid gland malignancies with clinically evident regional nodal metastasis should undergo a formal neck dissection, followed by appropriate adjuvant therapy. The management of the N0 neck in parotid cancer is controversial. Most of the available data recommend a neck dissection addressing at least levels II, III, and IV in the high-grade histology types: adenoid cystic carcinomas, high-grade, invasive carcinoma ex-pleomorphic adenoma, high-grade adenocarcinoma NOS, salivary duct carcinoma, and high-grade acinic cell carcinoma and in T3/T4 tumors regardless of histologic grade. The management of the neck in intermediate grade mucoepidermoid carcinomas is more controversial, with limited evidence in the literature. A pragmatic approach would be to consider addressing the neck in the presence of other high-risk factors.

The consideration of elective neck irradiation should be discussed in a multidisciplinary committee, with risks and benefits of both approaches being discussed with the patient. Unfortunately, given the rarity and histologic heterogeneity of parotid malignancies, formulation of a randomized controlled trial to define the management of parotid malignancies is not feasible. The role of sentinel lymph node biopsy is evolving and looks promising, but further studies are required to fully elucidate its benefits.

Filed Under: Head and Neck, TRIO Best Practices Tagged With: clinical research, treatmentIssue: January 2021

You Might Also Like:

  • What Is the Role of Elective Neck Dissection in Mucoepidermoid Carcinoma?
  • When Should Parotidectomy and a Neck Dissection Be Performed in Cutaneous SCC of the Head and Neck?
  • Elective Neck Dissection with Parotidectomy Should Be Part of P+N0 Disease Treatment in HNCSCC
  • When Should a Level IIB Neck Dissection Be Performed In Treatment of Head and Neck Squamous Cell Carcinoma?

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